it's d, they're lysosomes.
They help them to live.
for example if an animal came from a semie wrm inviornment and went to a cold enviornment. it would have to adapt to live there. if it didnt it would most likly die of starvation, dehidration, or other animals.
C) The nutrients are a part of the fertilizers that are often washed away into ponds.
Answer:
Polymerase chain reaction (PCR) is used to make many copies of DNA .
hope it is helpful to you.
The two layers of Earth that plate tectonics focuses on is lithosphere which consists of crust and the upper mantle.
Hope this helps :)