Please answer

After a glacier starts melting, the melted ice uncovers lifeless rock and gravel.

Which statement describes what usually happens next?

A. Shrubs that need direct sunlight begin to grow among the grasses

B. Grasses begin to grow in the rocky soil and add organic matter to it.

C. Bacteria on roots of seed plants use nitrogen from the air to make nutrients.

D. Lichens begin to grow in the bare rock and cause it to break down.

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

How do you date a sample of rock that you suspect as being one of the earliest on earth

Select the correct answer from each drop-down menu. during the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.