Q: Flatworms have a concentration of nerve tissue in the head end, which was a major step in the evolution of what organ? Choices: - liver - heart - kidney - brain A:
brain

(Question)
Q: Which branch of science is the study of energy, matter, and their interactions? Choices: - geology - biology - meteorology - physics A:
(Answer)
physics

Ques: Q: The stems of all vascular plants get longer through primary growth. this occurs in primary meristem at the tips and ______ of the stems. Choices: - edges - bottoms - layers - nodes A:
Ans: nodes

(Q).
Q: What division of the nervous system controls involuntary activities that are not emergencies, such as the digestive organs breaking down food? Choices: - central nervous system - posterior division - somatic nervous system - parasympathetic division A:
(A).
parasympathetic division

Ques:Q: How does the number of protons compare to the number of electrons in an electrically neutral atom? Choices: - they are half - they are double - they are triple - they are equal A:

Ans:they are equal

Ques: Q: How many pairs of chromosomes are in the human genome? Choices: - 21 - 24 - 13 - 23 A:
Ans:
23