Which of the following examples best describes a disturbance that is likely to result in significant, long-lasting changes to an ecosystem? Choose 1
Choose 1

(Choice A)
A
A warm, wet growing season leads to a 5\%5%5, percent increase in acorn production by oak trees.

(Choice B)
B
A hurricane storm surge washes away many grasses and flattens the sand dunes that border a beach.

(Choice C)
C
A colder-than-average winter results in a delayed thaw, causing a small lake to remain frozen for longer than usual.

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer