Answer:
I think its c Scientists cannot determine how it changes.
d). It increases over time.
I would say excretion since that means the process of expelling waste matter.
Answer:
12. In our somatic (body) cells, we have 2N chromosomes, but in our sex cells (sperm & eggs), we have half the number of chromosomes, which is N chromosomes
Explanation:
The growth of plants and formation of land mammals characterized the paleozoic era.
