A glucose molecule is the monomer of starch and cellulose
excretory system: removes waste from blood.
respiratory system: obtains oxygen so the energy in the nutrients can be extracted.
circulatory system: transports nutrients from small intestine to the othet tissues.
nervous system: regulates and controls digestive functioning.
( Am not completly sure, but i think this is the answer)
It's B
Explanation:
Because the fossil record shows how organisms have evoluate from relatively simple organisms to more complex organisms
The center of an atom is a nucleas. you can find this answer in most textbooks on science
Answer:
A. It is a source of genetic variation
