Pencil lead is dull and brittle. That's why it breaks off when you drage it across paper. Therefore, pencil lead is made out of an element that is a?

- non-metal

- metal

- metalloids

- metalloid

Which of the following blood vessels are small, thin, and porous enough to exchange substances at the tissue level of organizationA) arterioles B) capillaries C) venules D) small arteries E) veins

5) Gases such as oxygen and carbon dioxide cross the plasma membrane by A) special gas transport proteins. B) osmosis through the lipid bilayer. C) active transport through protein channels. D) passive diffusion through the lipid bilayer.

Long-term effects of alcohol use: - diminished function - fewer white blood cells the long-term effects of alcohol use listed above match which body system? a. immune system b. nervous system c. digestive system d. cardiovascular system

Apparently, mating outside of monogamous pairings is widespread in species 2. What would be the logical prediction to make before comparing the testes size of males of the two species?

Which is a confirmatory test for drugs?

Australopithecines were the ancestors of monkeys. A. True B. False

A mutation that causes a human have 11 toes is (neutral, harmful, or beneficial.)

Cells of a fungus and an animal

Is cytoplasm prokaryotic or eukaryotic

Professor Jones surveyed her six classes and found that students who slept less than 5 hours the night before an exam received lower exam scores than those students who slept 7 hours or more.