As a man walks barefoot along the beach, he steps on a sharp shell. His foot automatically jerks upward, even before he feels pain. What process is this an example of? How does it help protect the man?

A pail of lake water is the same temperature as a lake. Compare the thermal energy of the pail of water with the thermal energy of the lake.

Explain how Earth gets energy from the sun and what the atmosphere does with that energy to help life survive on Earth.

Write the statement as an inequality. "6y is no more than 8."

Which gas forms less than one percent of the atmosphere, but is essential to life? a. carbon dioxide b. oxygen c. hydrogen d. nitrogen

Decide whether the statement is true or false. Give an explanation for your answer. If f(x) is a positive periodic function, then $\int _ { 0 } ^ { \infty } f ( x ) d x$ diverges.

Multiply. Write the product in simplest form. 4/9 x 3.

Explain why it is difficult to include water vapor in a graph that shows the percentages of various gases in the atmosphere.

Why is it difficult to include water vapor in a graph of the percentages of various gases in the atmosphere? How could you solve the problem?

Amelia bought roast beef for $6.85 per pound. Find the total cost if Amelia bought 4 pounds of roast beef. Justify your answer by using the Distributive Property.

Find each unknown number. Check your work.

$$\frac { b } { 4 } = 12$$

The senses of ___ and ___ depend on chemicals in the air and food. The sense of ___ depends on the stimulus of light. The sense of ___ depends on the stimulus of sound. The sense of ___ is found in all areas of your skin.

The senses of _____ and _____ depend on chemicals in the air and food. The sense of _____ depends on the stimulus of light. The sense of _____ depends on the stimulus of sound. The sense of _____ is found in all areas of your skin.

Federal regulations set standards for the size of the quarters of marine mammals. A pool to house sea otters must have a volume of ''the square of the sea otter's average adult length (in meters) multiplied by 3.14 and by 0.91 meter." If x represents the sea otter's average adult length and f(x) represents the volume (in cubic meters) of the corresponding pool size, this formula can be written as $f(x)=0.91(3.14) x^{2}$. Find the volume of the pool for each adult sea otter length (in meters). Round answers to the nearest hundredth. (a) 0.8, (b) 1.0, (c) 1.2, (d) 1.5.