A food chain consists of grass, cows, and humans. If the grass

field produces 86,000 kJm-2 year-1 of energy and the cows

contain 18,700 kJm-2 year-1 of energy then what is the trophic

efficiency?

A: 5%

B: 78%

C: 22%

D: 33%

When two species occupy the same niche in an ecosystem, the result of the competition is that one species will either have to move to a different environment, or it will die out.

Why are the guard cells so important in a leaf?

A child is admitted in the clinic with nausea, vomiting, constipation, hypophosphatemia, and glycosuria. after talking to the parents, the nurse learns that they are painting the house.

How is a covalent bond formed between atoms?

Do you think presence of symptoms plays a role in this harmful gene persisting? Why or why not?

The table below shows a list of radioisotopes and their half-lives. The radioisotope that has the longest half-life is the best to use in powering planet and space exploration vehicles because they can travel farther.

Describe briefly how non green plants get their food?

What was the science of classification and naming organisms based on the different characteristics called?

Which trait did Gregor Mendel examine from the pea plant when he planned his study? a plant height b color of the plant flower c traits that were easy to distinguish d all of the above

In a laboratory population of flies, the female flies are gray and the males are yellowish gray. Biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to