Ques: Q: What returns blood from capillaries to an atrium? Choices: - the lymph system - arteries - the liver - veins A:
Ans: veins

Ques: Q: The simplest and smallest particle of matter that still has chemical properties of the element is called? Choices: - a molecule - a nucleus - an isotope - an atom A:
Ans: an atom

Ques: Q: Bivalvia and gastropoda are classes of what phylum? Choices: - Insects - fishes - diatoms - mollusks A:
Ans: mollusks

Ques: Q: What two things collide to cause gas pressure? Choices: - gas particles and an electron - light particles and an object - gas particles and a wave - gas particles and an object A:
Ans:
gas particles and an object