What is being defined below? a dark, organic material composed of partly decayed leaves and plants that adds nutrients and water-retaining ability to soil

a. humus

b. deciduous

c. top soil

d. coniferous

What is most likely to happen to the ecosystem if red-tailed hawks are removed

How old is bone in which the carbon 14 in it has undergone 3 half lives

Large scale evolutionary trends are the results of

There can be multiple comparison groups in a randomized trial. a. True b. False

Why do bonds with lower seniority have higher yields than equivalent bonds with higher seniority?

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

There appears to be some relationship between population density and the presence of large dead zones.