Ques:Q: The numbers and types of species in most ecosystems change to some degree through time and this is called? Choices: - physiological succession - continuous succession - environmental succession - ecological succession A:

Ans:ecological succession
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Ques:Q: Pressure relationships inspiration (or inhalation) and expiration (or exhalation) are dependent on the differences in pressure between the atmosphere and these? Choices: - salts - enzymes - bones - lungs A:

Ans:lungs
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Ques:Q: Blood vessels blood pumped by the heart flows through a series of vessels known as arteries, arterioles, capillaries, venules, and veins before returning to this? Choices: - lungs - feet - brain - heart A:

Ans:heart
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Ques:Q: Photosynthesis is initiated by what hitting plants? Choices: - dirt - air - moisture - sunlight A:

Ans:
sunlight
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