What is a photosystem in a chloroplast?

A student uses a computer to determine the effects of increasing pollutants on the animals in a zoo. What is this kind of modeling called

In the ionosphere, the collision that raises the energy levels of oxygen and nitrogen occurs between which of the following? Select all that apply. gas atoms protons electrons neutrons

The carbohydrates seen here contain three common elements. they are a. carbon, hydrogen, and oxygen. b. oxygen, nitrogen, and sulfur. c. hydrogen, oxygen, and nitrogen. d. carbon dioxide, hydrogen, and phosphorus.

Trauma to a joint that causes injury to the surrounding ligament is called

What would be a valid conclusion to draw from this data? A) All methods are effective in killing bacteria. B) Both soap brands out perform hand sanitizer in killing bacteria. C) Warm water is as effective as soap or sanitizer in killing bacteria.

A population is defined as all of the inhabitants of a given country or area considered together. a. True b. False

How does random fertilization add to genetic variation? a) reshuffling of randomly picked up chromosomes b) random fusion of genetically unique gametes c) exchange of genetic material between homologous chromosomes

When the energy of a light wave is transferred to a particle and causes it to vibrate and generate heat, the energy of the light wave is what?

Which statements about a child with brown eyes must be true? Choose more than one answer

I observe that squirrels that live in the southeastern United States are much thinner than squirrels that live in the northeastern part of the country.