What structure prevents food and liquids from entering the trachea?

Match the following. 1. biosphere The zone or layer of air, land, and water at the earth's surface occupied by living things 2. extinct All the living things of a particular kind so few in number that they are threatened with extinction 3.

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Explain how a sinkhole lake is formed.

When the doctor hits your knee with the little red hammer, why does your leg move? Explain the neural pathway involved.

Is the ability of a species or organism to survive and reproduce.

In the following example, what is the independent variable? Hypothesis: Mice receiving Drug-A will pass through a maze faster than mice receiving a water placebo.

You've seen two hbs molecules stuck to each other. imagine a third one randomly bouncing up to them. how could it get stuck on?

Which scientist first said that planets travel in fixed paths or orbits A) Kepler B) Ptolemy C) Galileo D) Copernicus

Describe the process of inhalation

In a Venn diagram, the separate circles contain characteristics unique to each item being compared, and the intersection contains characteristics that are common to both items being compared.