Answer:
It's based on the natural radioactive decay of certain elements, such as potassium and carbon.
Explanation:
Answer:
To establish the age of a rock or a fossil, researchers or scientists use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
Explanation:
scales
ectothermic
amniotic eggs
beaks
feathers
hollow bones
Answer:
Scales
Amniotic eggs
Beaks
Explanation:
According to the reading,
"Birds are said to have evolved from the Reptilia. They do have some similar features. They have scales on their legs and feet; they lay amniotic eggs, but with a hard shell; they have beaks, similar to many reptiles, particularly turtles."
It's an extended period of rain. Hope this helps~
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Answer: Migraine
Explanation:
Migraine is a powerful headache that leads to nausea, sensitivity to light and vomiting. It can lasts for 3 to 4 days and sometimes longer.
Most of the people suffering from migraine is 10 to 40 years of age. The headache in this case is extreme.
The person feels sensitivity towards light and does not feels good with any type of smell and light.
How many times does the rrTt combination appear in this Punnett square?
Answer: The combination produced is RRtt.
The combination rrTt does not appear in this punnett square.
Explanation:
As the problem does not indicate more information, I assume that punnett square is made between two RRtt genotypes. It can produce gametes that have the alleles Rt. A gamete is a sexual cell (egg or sperm) that has only one allele of each gene. And, each gamete codes for a different gene. Since here we have two different types of alleles (R and t), it is a dihybrid cross.
A Punnett square is a diagram used to predict the genotypes of a cross or breeding experiment. It is used to determine the genotypes and phenotypes of the offspring. To do it, you have to label the rows with one parent's gametes and label the columns with the other parent's genotype. Then, have each box inherit letters from its row and column, and interpret the results.
Then, the punnett square (shown in the picture) will be between RRtt and RRtt whose gametes can only be Rt, so Rt x Rt will be made.
The result in an offspring which will be 100% RRtt, and there is no rrTt combination here because non of the parents have an r allele, then none of the children can inherit it.
To have an offspring where rrTt genotype is shown, a different genotype must be used, in which both parents must have at least one r allele and one t allele. For example, it could be Rrtt x rrTt.
Answer;
Two different shell patterns are increasing in frequency, while the most common pattern is decreasing(CA).
The statement that is most likely true about the population is that two different shell patterns are increasing in frequency, while most common pattern is decreasing.
Explanation;
Disruptive selection involves changes in population genetics such that the extreme values of a trait are favored over the intermediate values.
Disruptive selection often drives speciation.
It may also occur when environmental changes favor individuals on either end of the phenotypic spectrum.
B) vitamin b
C) vitamin c
D) vitamin d
2. Appositional growth ends in
A) infancy
B) adolescence
C) early adulthood
D) late adulthood
3. What is the name of process of the addition of new layers of bone
A) ossification
B) appositional growth
C) diaphysis
D) epiphysis
4. which of the following sections of the spinal column have five vertebrae
A) the cervical section
B) the thoracic section
C) the coccal section
D) the lumbar section
5. what provides the bone with flexibility and tensile strength
A) calcium
B) collagen fibers
C) vitamin D
D) adipose tissue
6. The process of moving body part around a central axis is
A) flexion
B) adduction
C) supination
D)rotation
7. The bone of the extremities are part of the
A) appendicular skeleton
B) axial skeleton
C) long bone group
D) medial skeleton
8. what type of bone is a skull bone
A) lone bone
B) short bone
C) flat bone
D) irregular bone
9. The shoulder is a type of ____ joint
A) plane
B) ball-and-socket
C) pivot
D) saddle
10. The skull and spinal column are part of the
A) Appendicular skeleton
B) axial skeleton
C) flat bone group
D) peripheral skeleton
1. The right answer is D.
Vitamin D is an organic substance necessary for the metabolism of the body. A large part of our needs (80%) is synthesized from a derivative of cholesterol under the action of UVB radiation from the sun, it is also for this reason that it is also called "sun vitamin" . The rest must be drawn from the diet.
It intervenes in the absorption of calcium and phosphorus by the intestines, then in the reabsorption by the kidneys. Indispensable for growth during infancy, it ensures the robustness of the human skeleton and prevents osteoporosis. After a certain age, the body does not synthesize vitamin D as easily.
2. The right answer is C
Growth can continue until the age of 25 in a man and 18 in women, and contrary to popular belief, it is not uncommon to grow to over 21 years and it is impossible to predict a growth stop or define the future size of any individual.
3. The right answer is A
Ossification always begins in the median region of the diaphysis, under the perichondrium, by a small ring of bone generated by osteoblasts arising on the inner side of the perichondrium; these cells secrete around them layers of ossein impregnated with calcareous salts; from this moment the perichondrium must be called the periosteum.
This same process of ossification extends under all the internal surface of the periosteum and reaches the neighborhood of the epiphyses.
4. The right answer is D
The lumbar vertebrae are vertebrae of the caudal part of the spine. They are located between the thoracic vertebrae and the sacrum. They allow large flexion and extension movements, limited lateral flexion movements, and discrete rotations.
The most caudal lumbar vertebra articulates with the sacrum to constitute the lumbosacral hinge, junction between the mobile part and the fixed part of the column.
5. The right answer is B
Collagen is an extracellular protein found in vertebrates that forms insoluble fiber.
In bone, collagen is produced by osteoblasts and forms lamellae that give the bone its resistance to stretching. Collagen cartilage allows the joints to resist tensile forces.
6. The right answer is D
The bones forming the skeleton are articulated (by more or less mobile joints: if the bones of the skull remain welded to each other, the vertebral joints allow slight movements while maintaining their role of support, while the joints of the limbs assure rotations around axes with one (finger) or several (elbow) degrees of liberty).
7. The right answer is A
The appendicular skeleton of the human body is composed of 126 bones. The word appendicum is the adjective derived from the word appendix, which means part adjoined to something larger. From a functional point of view, the appendicular skeleton is intended for locomotion (lower limbs) of the axial skeleton, and for the manipulation of surrounding objects (upper limbs).
8. The right answer is C
The flat bones are composed of a spongy tissue in the center and a compact tissue on the outside. This type of bone structure forms cavities that protect the noble structures. This is the case of the skull, the thorax and the pelvis. In addition, they serve as an intersection with large muscle masses.
9. The right answer is B
The shoulder consists of three bones, the clavicle, the scapula or scapula and the humerus.
The mobility of the shoulder is provided mainly by the deltoid muscle, which provides power, and by the muscles of the cap, which initiate movement and stabilize the head of the humerus.
The rotator cuff is the name given to all the tendons that form a "hat" above the head of the humerus.
Between the head of the humerus and the acromion (outgrowth of the scapula), is a slip exchange called sub-acromial stock exchange.
10. The right answer is B
The axial skeleton consists of 80 articulated bones among 88 bones, all skeletal and mostly odd (and medial), forming the head and trunk. It includes the bones of the skull, spine, ribs and sternum, as well as the laryngeal bone, and represents 57 different articulated bones among 65 different bones.
Based on the information, it should be noted that bones absorb vitamin D) vitamin D.
Vitamin D is an organic substance necessary for the metabolism of the body. A large part of our needs (80%) is synthesized from a derivative of cholesterol under the action of UVB radiation from the sun, it is also for this reason that it is also called "sun vitamin" . The rest must be drawn from the diet.
It intervenes in the absorption of calcium and phosphorus by the intestines, then in the reabsorption by the kidneys. Indispensable for growth during infancy, it ensures the robustness of the human skeleton and prevents osteoporosis. After a certain age, the body does not synthesize vitamin D as easily.
The correct option is D
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