Which is a controlled variable in this experiment?

A. number of pots

B. amount of water

C. amount of phosphate

D. amount of blooms on a plant

In normal females, the second x chromosome forms an inactive mass called?

What color indicates a positive result before the addition of zinc? after?

Hiv, the virus that causes aids, was discovered in the early 1980s. because it is a relatively new virus, there are many myths and misunderstandings that surround this virus. false true

What does the background extinction rate tell us? the number of organisms that would go extinct if humans were not here They are cause for concern; they are many times greater than before.

During a game of Marco Polo, one swimmer closes her eyes and calls out "Marco!" The other players respond by saying "Polo!" The person with her eyes shut then tries to locate and tag the other players.

Consider an autosomal recessive neurological disorder that is lethal in childhood. in a population in hardy-weinberg equilibrium, 1 in 750 infants are affected with this condition. a.

Which has prokaryotic cells A. rose thorn B. beet root C. Lactobacillus D. human kidney

If you wanted to study the diversity of organisms at all levels of biological organization what Would You Study

A female zebra finch reared by a father with a red feather taped to his head will select a mate with a similar ornament over an unornamented male. What are plausible ultimate explanations for this behavior (i. e.

What do birth rate, death rate, immigration, and emigration determine about a population?