What are two structers in eukaryotes that likley evolved through endosymbiosis?

the answer is mitochondria and chloroplasts believe it or not but these two are the only organelles that have their own DNA and ribosomes. mitochondria and choloroplast were at one time small prokaryotes that began living inside larger cells.

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.