Answer:
A
Explanation:
Abrasion
Answer:
A
Explanation:
Chordates have postanal tails.
B.Chordates have longer tails than nonchordates.
C. Chordate tails are ventral in origin.
The Correct answer is A. i just took a test on this
Answer:
By the end of meiosis, four cells will be created, each with one of the chromatids from the tetrad. Also, don't forget that there are 23 different tetrads formed during meiosis because each chromosome 1-23 will have a tetrad.
In humans, four tetrads form during the synapsis of meiosis.
In humans, a total of four tetrads form during the synapsis of meiosis. Synapsis occurs during Prophase I of meiosis, where homologous chromosomes pair up and form a structure called a bivalent. Each bivalent consists of two pairs of sister chromatids held together by a protein structure called a synaptonemal complex. Since there are 23 pairs of chromosomes in humans, there will be 46 total tetrads formed during meiosis, as each homologous pair forms a tetrad.
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a. True
b. False
Answer:
In a process called radiometric dating, scientists measure the fix decay rate of an isotope to determine the age of the earth.
Explanation:
In the process of radiometric dating we can find the age of fossils, how long the rocks formed and fossils contains within those rocks. Radiometric is very accurate to date the earth, and radioactive decay of unstable isotopes like uranium, carbon and potassium that are slow to decay.
Scientist measures the fixed decay rate during the radioactive decay, it happens when an unstable atomic nucleus continuous changes to lower energy state and splits the radiation.
b. Fetal period
c. Preimplantation period
d. Unattached conceptus?
Answer;
Embryonic period
Explanation;
The germinal stage is the period of gestation from fertilization or conception, when the egg meets the sperm, to implantation of the embryo in the uterus. The embryonic stage of gestation is the period after implantation, during which all of the major organs and structures within the growing mammal are formed.
-Embryonic period begins at fertilization (penetration of the egg by the sperm) and continues until the end of the 10th week of gestation (8th week by embryonic age). The period of two weeks from fertilization is also referred to as the germinal stage.
Answer:
Option D
Explanation:
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