Q: What are the two main parts of the human nervous system? Choices: - lungs, brain - lungs, spinal cord - brain, heart - brain, spinal cord A:
brain, spinal cord

(Question)
Q: What was the first mass extinction that occurred on earth? Choices: - late Devonian mass extinction - paleozoic mass extinction - proterozoic mass extinction - precambrian mass extinction A:
(Answer)
precambrian mass extinction

Ques: Q: Pure nonpolar covalent bonds exist only between what? Choices: - two altered atoms - two producing atoms - three altered atoms - two identical atoms A:
Ans: two identical atoms

(Q).
Q: What is the term used to measure the intensity of sound waves? Choices: - amplitude - phon - hertz - decibel A:
(A).
decibel

Ques:Q: What branch of science aims to understand all about our planet and its environments? Choices: - biology - immunology - petrology - earth science A:

Ans:earth science

Ques: Q: Stimuli in the brain, stomach, and small intestine activate or inhibit production of what secretion? Choices: - metabolic juice - sweat - digestive juice - gastric juice A:
Ans:
gastric juice