Which best describes bacterium?

A. The shell surrounding a pilus

B. A particle that attacks viruses

C. A single celled organism

D. A type of virus

What happens to a cell during the first cell cycle

How does the immune system work together with the circulatory system to function properly? A. The immune system's pathogens work to fight and destroy invaders. B.

Which is equal to 7 hectometer? Performing metric unit conversions

What is the definition of a gene pool

Which system recieves and sends electrical signals through out the body? a. muscular c. nervous b. skeletal d. cardiac

Many Head Start programs have a community aide who A. tutors at-risk children in the home. B. gives families the money they need to survive. C. connects families to community resources they need. D. represents families at family/teacher conferences.

Stranded on an island, you have two sources of water to drink: salty ocean water and contaminated fresh water. explain your choice of drinking water and indicate why your selection is the best choice.

How are a hypothesis a prediction and an experiment related

Two species of garter snakes live in the same geographic area. One lives mainly in water and the other mainly on land; therefore, they rarely encounter each other and do not interbreed. What type of isolation is this?

Matter that has a definite column but no definite shape is a