Answer:
b
Explanation:
all living things are made up of cells.
Answer:
i believe it would be the last option
Explanation:
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It should be true due to adaptations. when a bird doesn’t stay for winter weather so it adapts by migrating to the south during the cold weather
Answer:
Testing positive for HIV means a high chance of death and a good chance of lower reproduction rates. But some people are immune to HIV, which makes them more evolutionarily fit, likely to live longer, likely to reproduce more, which would increase the frequency of the immune allele in the population. Over time, this increase in frequency of the gene that causes immunity could spread across the human race and cause it to evolve.
The esophagus squeezes food down the digestive tract by an involuntary synchronized muscle movement called the Peristalsis
