After a volcanic eruption, ecosystems undergo a series of events known as succession. a study done by ecologists on mount st. helens concludes that primary succession occurs when lupines are able to enrich the soil. lupines are a nitrogen-fixing plant well adapted to colonizing sterilized ecosystems. however, the progression of the lupine is slowed by a certain predatory caterpillar. what would be the most successful strategy for ensuring succession in an area where lupines and the caterpillars both colonize? a) introduce a controlled fire to begin secondary succession b) move the caterpillar populations to a different area c) spread lupine seeds to increase the density of growth d) replace the lupines with another type of plant

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

Greenthe fossil record is the history of life recorded byhuman observationgod. climatologists. remains of the past.

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.