Respiration returns carbon dioxideoxygennitrogen to the atmosphere

Which statement best describes scientific theories? Choose one answer. a. Scientific theories are based on facts that describe natural events. b. Scientific theories describe natural events but do not explain them. c.

Algal cells are placed in an isotonic solution. Additional amounts of solutes are slowly added to the solution. What happens to the cells? Question 7 options: They will begin to swell. They will burst. They will stay the same. They will shrink.

How are amphibians able to mostly keep oxygenated and deoxygenated blood separated and prevent mixing in the ventricle?

Which of the following color best absorbed by green plants

What action should you take when an earthquake occurs?

Lymph carries all of the following except A. salts. B. nutrients. C. blood. D. oxygen.

Mutations are not always predictable. Which word best describes this situation? A) evident B) abnormal C) random

What are the main organs of the muscular system

Which statement is accurate about evolution A. Natural selection changes the genetic makeup of a population B. Evolution maintains the genetic similarity of a population C. Mutations are generally harmful D.

What are 3 reasons that cells need to divide? must be in a complete sentence