Blood flows directly from the left atrium to _____
a. the aorta c. the right atrium
b. the left ventricle d. the pulmonary arteries
B
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Your microwave will not turn on, and you speculate that a circuit breaker in the house has been tripped. In scientific terminology, the steps would be described as:
A. forming conclusions from the results of experiments. B. developing an observation based on a hypothesis. C. developing a hypothesis based on an observation. D. testing a prediction generated from a hypothesis.
Xylem and phloem are types of
a. ground tissue. b. protoderm. c. vascular tissue. d. meristem. e. dermal tissue.
Why are valves important in veins?
What will be an ideal response?
Which of the following hormones is released by the posterior pituitary gland?
A. insulin B. thyroid-stimulating hormone (TSH) C. oxytocin D. follicle-stimulating hormone (FSH) E. None of the answer choices is correct.