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

How does blood flow through the heart?

If the producer population in an ecosystem decreased, what would most likely happen to the size of the herbivore population?

What is the process used by the cell to remove large molecules?

Which of these best describes Earth's mantle? A. Most dense layer, consists of the outer and inner parts B. Thinnest under the oceans and thickest under continents C. Middle layer, density increases with depth as pressure increases D.

A seed has alleles for color (yellow or green) and shape (round or wrinkled). How did Mendel's law of independent assortment describe how these traits were passed from parents to offspring. Check all that apply.

A substance is on its fifth half-life. Which approximates the percentages of radioactive and stable isotopes, respectively? 96.9%; 3.1% 3.1%; 96.9% 12.5%; 87.5% 87.5%; 12.5%

Cephalopods are known for having highly developed nervous systems which includes a highly developed eye and the ability to change their coloration. Provide two ways that this is beneficial for organisms in this class.

What is cellular respiration and fermentation?

Why do fertilisers need to be soluble

Viruses, unlike bacteria, are not living organisms. Based on the information in the table, which of the following provides evidence to support this statement? A. Bacteria are made up of cells, whereas viruses are not made up of cells. B.