What can you conclude about an ecosystem with many trophic levels?

A. It is an unhealthy ecosystem.

B. It is a stable ecosystem

C. It has very few producers.

D. It has no tertiary consumers.

NaBr + Ca (OH) 2 → CaBr2 + NaOH Type of reaction:

Distinguish between autotrophs and heterotrophs give an example of each

What structures allow t cells to locate and destroy invaders?

Most terrestrial biomes are defined by their average annual temperature and precipitation

Fertilizers, pesticides, and herbicides can drain out of the soil and reach waterways such as rivers, lakes, and oceans. This process occurs via

On the coast, strong sea breezes move cool air into the land to replace warm, rising air. This often causes A) cyclones. B) hurricanes. C) thunderstorms. D) tornadoes.

Which steroid hormone (s) would not be produced if you blocked the activity of p450scc?

Probably the main reason Africans, rather than Native Americans, became slaves in America was that? A. Indians passed North American diseases to the Europeans. B. Africans and Europeans shared immunities to Old World diseases. C.

Structures through which conduction impulses pass, in sequential order, causing the heart to contract:

When a river or stream flows downward into a basin that is surrounded by high ground on all sides, what can form a. a lake b. a creek c. a sinkhole d. a delta