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STatiana [176]
3 years ago
12

What structures do all organisms have in common in the earliest stages of embryonic development

Biology
1 answer:
satela [25.4K]3 years ago
4 0

The early stages of embryonic development begin with fertilization. The process of fertilization is tightly controlled to ensure that only one sperm fuses with one egg. After fertilization, the zygote undergoes cleavage to form the blastula.

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Some have speculated that the origin of life occurred at geothermal vents. amino acids can form there. compared to the amino aci
cluponka [151]

There are a number of amino acids that have formed under certain environmental conditions if the required elements are present and the energy conditions ar compatible with chemical assembly. These conditions have also allegedly formed amino acids on meteors, asteroids and comets.


But, amino acids are a very minor component of more complex biochemical assemblies required for life. Pentose sugars are also required, which form under different environmental conditions than amino acids. More importantly, only left-handed homochiral amino acids and right-handed homochiral sugars can form functioning biochemical assemblies that are viable in an organism. But, natural conditions, like hydrothermal vents only produce racemic versions of sugars and acids, meaning they are always approx. 50% left and right handed. This is fatal to forming viable biochemical assemblies.


Further, it is not possible for all of the 20+ homochiral amino acids needed for a living organism to form naturally. The only ones found have been the simpler amino acids. Also, the 4 critical nucleotide amino acids, C, G, A, T, do not form naturally, are not homochiral, nor in the right proportions.


The geo/hydrothermal vent conjecture is nonsensical. These are open systems, susceptible to currents, mineral contamination, salinity, ph, and temperature, making them a totally unacceptable environment for the precise and exact placement of elements to assemble to form life.

3 0
3 years ago
The fertilization of a female egg cell with a male sperm cell is also referred to as______________.
creativ13 [48]
<span>The fertilization of a female egg cell with a male sperm cell is also referred to as Conception (option D)

This process is also known as generative fertilization, conception, syngamy and impregnation. It is the union of gametes to begin the development of a new individual or organism.
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8 0
3 years ago
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Which of the following describes the pathway that nerve impulses travel while throwing a baseball?
Alex_Xolod [135]
The correct answer is A.
8 0
3 years ago
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A scientist raised a species of fruit flies over several generations in separate containers. The diagram shows what
White raven [17]

Answer:

This is allopatric speciation. The organisms were separated from each other by the containers. The separation caused them to evolve to the point that they were more likely to mate with each other than with a member of another tank.

Explanation:

4 0
3 years ago
Name of the german scientist from the 1800's that studied animals
charle [14.2K]

Answer:

Theodor Schwann is a german scientists from rhe 1800s

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