Q: Systemic veins return blood low in what to the right atrium? Choices: - dioxide - nutrients - nitrogen - oxygen A:
oxygen

(Question)
Q: What can help scientist gather information for an investigation? Choices: - variables - controls - conclusions - observations A:
(Answer)
observations

Ques: Q: What are regular changes in biology or behavior that occur in a 24 hour cycle? Choices: - cognitive rhythm - auditory rhythm - life cycle - circadian rhythm A:
Ans: circadian rhythm

(Q).
Q: There are two types of digestion, mechanical and what else? Choices: - radiation - mineral - thermal - chemical A:
(A).
chemical

Ques:Q: All planets exhibit the same or nearly the same direction and shape of what path around the sun? Choices: - revolution - ellipse - nucleus - orbit A:

Ans:orbit

Q: Chemical equations in which heat is shown as either a reactant or a product are called what? Choices: - hydroelectric equations - thorium equations - feedstock equations - thermochemical equations A:
thermochemical equations