Which of the following is not evidence supporting the endosymbiotic theory?
a. mitochondria and chloroplasts are nearly identical to some free-living prokaryotes.
b. mitochondria and chloroplasts divide by splitting.
c. mitochondria and chloroplasts have their own dna.
d. the vacuoles can "come and go" across the plasma membrane.

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature above 37 degrees celsius (98.6 degrees f)? describe what might happen if the temperature decreased by 10 degrees celsius.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.