Q: The heart and a network of blood vessels that run throughout the body make up what organ system? Choices: - lymphatic system - respiratory system - immune system - cardiovascular system A:
cardiovascular system

(Question)
Q: How many protons do all atoms of a particular element have in their nuclei? Choices: - varying number - three - zero - same number A:
(Answer)
same number

Ques: Q: What type of creature is a scallop? Choices: - insect - vertabrate - algae - mollusk A:
Ans: mollusk

(Q).
Q: What is the growing root tip protected by? Choices: - root flap - tip cap - root hinge - root cap A:
(A).
root cap

Ques:Q: When sparks from a steel grinder react with oxygen, what do they form? Choices: - rust - spontaneous combustion - steel oxide - iron oxide A:

Ans:iron oxide

Ques:Q: Fog disappears when the water droplets change back to what? Choices: - cold vapor - ice vapor - solid vapor - water vapor A:

Ans:
water vapor