What is a base?

A. a substance that can donate an H + ion

B. a substance that has a low pH value

C. a substance that is alkaline

D. a substance that can accept an OH - ion

What is it called when a blue bird and a red bird mate and produce a red and blue dotted offspring?

It is the best to say that most humans sources of air pollution result from ___.? A. Forestry management B. Fuel burning C. Heating devices D. Vehicle exhaust

Which structures are part of the body's first line of defense against pathogens? A. white blood cells B. red blood cells C. lymph nodes D. mucous membranes

How many codons are there in a chain of 12 nucleotides? Show work, circle answer.

Which of the following renewable energy sources can be used for electricity, vehicle fuel, and heat? a. wind b. biomass c. geothermal d. water

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.