The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?

A. 25 g

B. 100 g

C. 75 g

D. 50 g

Which describes a natural environment with the least biodiversity? A. 20 small flowering plants, 44 polar bears B. 44 arctic foxes, 25 small flowering plants C. 31 polar bears, 19 arctic foxes, 52 small flowering plants D.

The "zone of avoidance" a) Accounts for the absence of any planet between the orbits of Mars and Jupiter Prevents collisions between planets in the Solar System.

A push pull or other action that has the ability to change motion

How long until you can swim after a belly button piercing?

A 500 G ball and a 200 g or dropped from a tower. Those balls are the same size and there is no air resistance. Which one hits the ground first? the 500 g the 200g they both hit at the same time

How would life on earth be different if earth's axis were not tilted with respect to its orbit? A. There would be no seasons. B. There would be no day and night. C. All places would have the same climate. D. The seasons would be much shorter.

What will a spring scale read for the weight of a 75.0-kg woman in an elevator that moves upward with constant speed of 5.8 m/s?

What's the definition of: • cellular respiration • photosynthesis

What are the steps that are important to take for your safety during an earthquake? a. stay away from walls and windows c. stay away from electrical and gas lines b. get under a desk or table d. all of the above

You have an open air column of length 1.40 m in air at 24.2 °C. What is the frequency of the third harmonic?