Match the following circulatory systems with the correct animals.

1. closed circulatory system

2. two-chambered heart

3. four-chambered heart

a) fish b) earthworm c) birds

Cell engulfs microorganisms in cell "eating": pinocytosis active transport phagocytosis passive diffusion facilitated diffusion

Which government agency would you expect to be most concerned with the impacts of pollution?

Sarah turns quickly and sees the soccer ball hurtling toward her face. She blinks and ducks for cover. During this reaction, Sarah perceived the ball, decided what to do, and then blinked.

After mixing A heat-killed, phosphorescent (light-emitting) strain of bacteria is mixed with a living, non-phosphorescent strain. Further observations of the mixture show that some of the living cells are now phosphorescent.

Large, slow brain waves called Delta waves are most associated with which stage of sleep?

Bacteria of species A and species B are kept in a single test tube, where they are fed two nutrients. Each day the test tube is supplied with 19,880 units of the first nutrient and 32,070 units of the second nutrient.

How does snake venom poison humans

The hypothesis of continental drift is used to explain an event that happened a. two million years ago. b. two hundred million years ago. c. two billion years ago. d. two hundred billion years ago.

What factors contributed to increased interest in conservation in the 1960s?

True or false photosynthesis occurs in the chloroplast in prokaryotes.