What element has 81 protons in the nuclei of its atoms?

The immune system is built on millions of cells called a. blood cells b. leukocytes c. lymph cells d. immune cells

this diagram shows molecules moving across a selectively permeable membrane. the smaller circles represents salt molecules, and the dashed line represents the membrane. which statement best describes the movement of the salt molecules

What effects does water have on the formation of macromolecules?

Science vs pseudoscience

Describe a way people are connected to other living things and nonliving things on earth

Which term was used by mendel in the observations of pea plants

Charles c. is a 65-year-old executive who is very overweight and has recently been diagnosed with high blood pressure.

During sleep, the body provides fuel to the brain during sleep, the body provides fuel to the brain by breaking down body proteins. by converting glucose to glycogen. the body does not provide fuel to the brain during sleep. by engaging in ketosis

What happens to glucose inside a cell during cellular respiration? A. The cell uses ATP to break down glucose. B. The cell uses oxygen to break down glucose. C. The cell uses water to break down glucose. D.

The burning of fossil fuels has harmed the environment by