The scheme of modern taxonomy goes:
Life > Domain > Kingdom > Phylum > Class > Order > Family > Genus > Species
So, a PHYLUM is made of several classes.
Answer:
air
Explanation: without air you can cant even live
Gene mutations can be passed on to future generations and drive natural selection. ... Gene mutations can be helpful, harmful, or neutral for an organism's survival. Only mutations that are helpful in the organism's environment would influence its survival and reproduction
<span>main function of the circulatory system in multicellular organisms is to circulate blood and oxygen in our body .so the right option is
</span><span>A) to bring oxygen into the lung
</span>hope this helps
