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Questions (14)

The diameter of a human hair is 9 \cdot 10^{-5}9⋅10−5 9, dot, 10, start superscript, minus, 5, end superscript meters. The
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2. 125 views
Which describes the alveoli?a. They work with the villi to exchange oxygen and carbon dioxide. b. They have very thick walls to
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2. 100 views
The _____ all help maintain homeostasis by excreting wastes.a. Lungs, liver, stomach, and kidneys b. kidneys, lungs, skin, and
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2. 91 views
Which role do nephrons play in the excretory system?a. filter urea and other wastes out of the blood b. move proteins and other
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2. 96 views
The role of the kidneys is _____.A. to eliminate urea, excess water, and carbon dioxide from the body B. to collect wastes from
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2. 78 views
Disease-causing toxins are produced by _____.a.bacteria b.viruses c.fungi d.protists
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2. 79 views
Which are the four major groups of human pathogens?a.viruses, fungi, protists, and toxins b.protists, insects, bacteria, and
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2. 97 views
Which deadly infectious diseases can spread through food or water?a.tetanus and cholera b.dysentery and colds c.cholera and
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2. 73 views
_____ are examples of abiotic factors.a. Oxygen, soil, and fungi b. Soil, fungi, and bacteria c. Water, oxygen, and soil d.
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2. 69 views
Which is a list of biotic factors?a.water, soil, oxygen b.oak tree, ferret, eagle c.eagle, water, soil d.ferret, eagle, water
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2. 88 views
When would it always make the most sense for an ecologist to use sampling?a.when the population is small b.when a population is
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2. 77 views
Which method of determining population size involves estimating the number of individuals multiple times?a.indirect observation
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2. 105 views
_____ is an approximation of a number based on reasonable assumptions.A sample An observation A formula An estimate
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2. 56 views
Which method is appropriate for determining the population of organisms that are hard to observe?direct observation sampling
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2. 95 views