Answer:
Gradually released into the atmosphere by photosynthetic microbes, it formed two important gases new to fledgling Earth: breathable oxygen gas, or O2, and ozone, or O3. Together, the buildup of these gases enabled life to emerge onto land and evolve into the rich diversity of life-forms that inhabit Earth today.
Answer:
Look below
Explanation:
An organelle is a very small cellular part or structure that has a very specific job/task in the cell.
In a newly fertilized egg, the vitelline layer lifts away from the egg and hardens to form a fertilization envelope.
Therefore, the correct answer is Option A.
<h3>What is vitelline layer?</h3>
- Vitelline layer or vitelline membrane (VM) is a structure that surrounds the outer surface of the plasma membrane of an egg or ovum. In some organisms (e.g.: birds), the vitelline layer surrounds the extracellular yolk and the ovum.
- It is multilayered and functions to protect and give shape to the egg yolk and separate it from the egg white.
- VM consists of protein fibers and protein receptors necessary for sperm binding.
- As its function is to provide support and protection to the yolk, after fertilization, the vitelline layer gets hardened and separated from the yolk to form fertilization envelope.
Learn more about fertilization in sea urchins here:
brainly.com/question/10019212
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Answer:
A mutation happens by chance it cause by the rna polymerase copying the wrong piece of code from your dna leading the wrong protein to be made.
This could either be beneficial or not as it causes variation in a species helping them evolve becuase of survival of the fittest or threatening extinct of the entire specise if their environment has changed as it could threat their survival therefore having variation with in species could help increase their survival rate
