Why must controls (such as plants given water only) be used in the fertilizer experiment described in the study guide?

Months after last taking a drug, a former drug abuser still produces very little serotonin. the person is depressed and anxious and has great difficulty remembering new material. most likely, the abused drug-if it was a single drug-was:

Describe how the diffusion of ions across a cell membrane differs from the diffusion of non polar molecules across the cell membrane

A marine biologist explains that the salmon adapts to its environment through descent with modification. What is "descent with modification"? A heritable trait can be changed from one generation to another.

What happens to temperature and pressure as the depth within the Earth increases?

Name three ecosystem services provided by biodiversity.

Where is strep found in nature?

An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass? the neutron and the electron the proton and the electron the proton and the neutron the neutron and the atom

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?