Answer:
the answer is vertebral bones
Explanation:
the vertebral bones surrounded our spinal cord and our skull acts as an internal crash helmet to protect our brain
Answer:
Genetic variation
Explanation:
It could lead to natural selection, but natural selection isn't the cause. Many years down the road you could see a particular variation having a higher population, which is the result of natural selection/survival of the fittest via better camouflaging from predators.
Answer: C
Ribose molecules
<span>The molecules that provoke a specific immune response are called antigens.
</span>This molecule initiates the production of an antibody and causes an immune response. T<span>oxins, chemicals, bacteria, viruses, or other substances that come from outside the body can be part of the antigens.
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Plants use sunlight from the Sun to perform photosynthesis., in order to maintain a healthy ecosystem, you need a good balance between elodea plants and animals. this is because the elodea plants they use the carbon dioxide what animals make through cellular respiration.
