Answer:
Due to environmental conditions.
Explanation:
With the passage of time, environmental conditions change which causes the evolution of of four legged land animals from fish like creature. This change occurs due to change in environment. In water, there is no need for legs because fish moves with the help of fins and tail but the organisms that lives on land has legs in order to move from one place to another so we can say that change in the physical structure of organism occurs due to environment.
The answer would be 502 grams because of the law of conservation of mass, you can't create or destroy mass so then 2 grams plus 500 grams is 502. I am 100% positive that B is correct.
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<span>The answer is A, a sperm cell and an egg cell combine to form an embryo. Reproduction in living things, regardless of whether plant or creature, by and large, happens in cycles. All plants and creatures have life cycles. Some life cycles are more intricate than others, yet certain components have a tendency to be general and apply pretty much similarly to both plants and creatures.</span>
