Apopulation of squirrels lived together in a forest. an event occurred that caused the population to diverge into two different species over a long period of time. which of the following is most likely the event that occurred?

a) there was an increase in the predators in the forest.

b) a natural disaster occurred that separated squirrels.

c) the winters were unusually cold in the forest.

d) a disease affected the squirrel population in the forest.

You have a solution that contains phospholipid vesicles in a test tube. these vesicles have phospholipid bilayers, but do not contain any membrane transporters. you add a number of different molecules to the solution, and wait a period of time for them to equilibrate. if you could measure the concentration of each molecule, for which of the following would you expect to measure equal concentrations inside and outside of the vesicles? assume for this question that the overall osmolarity inside and outside the vesicles is the same (that is, there is no appreciable diffusion of water across the membrane). (select two answers) an amino acid with a hydrophobic side-chain a small non-polar molecule a negatively charged ion a small polar molecule a small lipid hormone

What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron

In a cladogram' when does a group of organisms branch off