Whales are closely related to hoofed mammals with an even number of toes, such as horse, because they evolved from them. Before whales were what we know them as today, they were relatively similar to horses. They used the water to flee from predators, and they evolved slowly to heighten their swimming ability, eventually becoming modern day whales. Fish have always been aquatic animals that have gills. Whales cannot breathe underwater, so they take in oxygen the same way a horse does. Also, both horses and whales are mammals that give birth to their offspring and are warm-blooded. Fish lay eggs and are cold-blooded.
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Answer:
Natural selection leads to evolution.
Answer: The Americas
Explanation:
Scientists use DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, DNA samples taken from __the Americas__ would have the most unique mutations, representing the most recent population to migrate to a new area.
The answer is it is a waste product produced by cellular respiration.
During Gas exchange in the lungs, oxygen replaces carbon dioxide, and oxygen,
oxygenates blood that spreads throughout the body, the Carbon Dioxide, which is
expelled from the lungs originated from the cellular respiration, which occurred
inside the body.
Use an electric car instead of a gasoline car; electric cars do not release anything into the atmosphere that would contribute to the greenhouse effect.
