BIOLOGY HIGH SCHOOL

Copies of chromosomes are called____1) platelets.

2)sister chromatids.

3)stem cells.

4) macrophages.

Answers

Answer 1
Answer:

Answer:

option 2

Explanation:

because there divide

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Which organisms are prokaryotes?
A ratio of 3:1 in the phenotype of an organism occurs when(A) the alleles are incompletely dominant. (B) only recessive traits are involved. (C) only dominant traits are involved. (D) alleles segregate during meiosis. (E) crossing over has occurred in Anaphase II.

Which of the following is an example of the endocrine system directly interacting with the nervous system?A. The vertebra protect the spinal cord from injury.

B. Hormones provide feedback that affects neural processing.

C. Sensory receptors in bones send signals about body position to the brain.

D. The brain sends signals that control the speed at which food moves through the intestines.

Answers

Answer:

B

Explanation: The endocrine system secretes hormones into blood and other body fluids. Hormones provide feedback to the brain to affect neural processing. Reproductive hormones affect the development of the nervous system. The hypothalamus controls the pituitary gland and other endocrine glands.

True/False
Bonding helps babies build connections in their brains.

Answers

The answer is true because it can help them start to talk because they see other people doing it.

Which of these statements best explains why the difference between summer and winter temperatures is greater in Russia than in Florida?

Answers

Florida is situated closer to the tropic of cancer which receives more constant and direct rays of the sun.

Florida is closer to the equator and it receives more rays and sunshine than Canada.

Why are catfish and carp found at the mouth of a river, while trout are found nearer the source?

Answers

Answer:

The correct reason would be "the levels of dissolved oxygen at the mouth of the river and at the source of the river".

The mouth of the river is the region where it flows into the ocean, lake, another river, reservoir, sea et cetera. The level of dissolved oxygen in this region is too low to support great biodiversity.

Organisms like catfish and carp can survive here due to their low oxygen demand. For example, catfish can survive in water with an oxygen content of 2.5 parts per million.

In contrast, the level of dissolved oxygen is higher at the source of the river. Organisms like trout are found here due to their high oxygen need. For example, rainbow trout require minimum 5-6 parts per million dissolved oxygen for its survival.
Catfish and carp require less oxygen than trout. The mouth of a river usually has less oxygen and the area closer to the source has more oxygen, so since catfish and trout require more oxygen they typically are found at the source.

According to Freud's psychoanalytic theory, rationality as well as logical thinking and reasoning are controlled by our ______.a. pleasure principle
b. superego
d. id
e. ego
f. preconscious

Answers

According to Freud's psychoanalytic theory, rationality as well as logical thinking and reasoning are controlled by our a. pleasure principle because it can instinctively lead us to satisfy our basic needs which form logical sequence.

Which of the following is true based on the cell theory?O Most organisms are made up of one or more cells
O Cells have many different components inside of them
O Cells can come from non-cellular sources
O Life starts at the level of the cell

Answers

I believe that the answer is: Most organisms are made up of one or more cells
Cell Theory was first developed in 1839 by Schleiden and Schwann, they stated that all organisms are composed of one or more cells.
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Your biceps muscle is attached with tendons to the top of your humerus and to the end of your radius, near your elbow. What would happen if the biceps were attached to the top and bottom of your humerus instead? You would not be able to pull your forearm up toward your shoulder. Your humerus would lengthen and shorten each time your biceps contracted. You would be able to pull your forearm toward your shoulder with more force. Your triceps muscle would make your arm bend backward when it contracted.
Many different species of songbirds migrate into the United States and Canada from Central and South America each summer in order to take advantage of the caterpillars and other insects that hatch in the northern forests during the summer. Over the past several decades songbird populations have been declining. How might a decrease in the number of songbirds be expected to affect the trees in a northern forest?