If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years? A. 5 grams B. 10 grams C. 20 grams D. 30 grams

The movement of tectonic plates in two locations is described below: Location A: Tectonic plates push together Location B: Tectonic plates pull apart Which statement is most likely true? Ocean basins may form in both locations.

Which cell structures are most directly involved in protein synthesis?

16. Most aquatic animals excrete ammonia, while land animals excrete urea or uric acid. What is the most likely explanation for the difference? A. land animals cannot afford the energy needed to make ammonia B. they have different diets. C.

What bone does not articulate directly with any other bone?

Discribe the process of natural selection.

Describe the process through which allopatric speciation splits 1 species into 2 distinct ones

What is an example of a limiting factor that humans use to control the carrying capacity of an environment for a particular type of organism? Explain your answer.

How does natural selection support the theory of evolution? A. Natural selection explains how the changes in life forms that evolve over millions of years take place over shorter periods of time. B.

Example of wave amplitude

Which biome is likely to be the home of zebras and lions?