Scientists believe that the early evolutionary ancestors of modern animals had an eye spot, a
small group of photoreceptor cells that can detect light vs. dark. How could an animal benefit
from having an eye spot (compared to not having any type of light detector)?

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah

the answer is d.) homologous; have mammary glands

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.