How do cells in the ovary detect a hormone from the brain?*

Single-celled organisms are able to maintain internal stability because they*

A similarity between humans and many other multicellular animals is that they*

In order to enter cells and be useful to the body, starch must be*

The increase of certain types of gases in the atmosphere has contributed to the problem of global warming. All these gases are*

Several goldfish were kept in a small aquarium for several years. The fish grew to be approximately 6 centimeters long in the first year, and after that, growth in length stopped. These fish were later transferred to a large pond. In the pond, the goldfish grew much larger, reaching lengths of around 25 centimeters. Which statement provides the best explanation for the increased growth of the fish in the pond?*

Autotrophs might survive when heterotrophs cannot, because autotrophs are able to*

The inability of sperm cells to move normally could prevent the production of offspring by interfering with*

Which type of pathogenic microbe causes AIDS?*

The diagram below represents a technique used to produce carrots.

Which reproductive process determines the traits present in the cluster of cells?*

The diagram below represents a scientific technique in use today.

Scientists have used this technique to*

DNA is able to control cellular activities most directly by regulating the process of*

Which statement describes an effect of natural selection on a species?*

Maple leaf beetles and willow leaf beetles are named for the type of tree where they live and reproduce. They look identical to each other when observed, but experiments have shown that willow beetles would starve before eating maple leaves. This is an example of specialization that would directly reduce*

Which event would most likely cause a change in a genetic sequence in an organism?*