Cells grown in laboratory culture dishes undergo only a fixed number of division before dying. The number of possible divisions drops depending on the age of the donor organism. This phenomenon is called the

A scientist cites fossil evidence to argue that modern whales evolved from relatively small, land-dwelling mammals. The scientist claims that a variety of fossil findings can be ordered in a sequence that demonstrates the evolutionary lineage.

How can astronomers use rocks from the moon to estimate the age of the solar system?

Match the following parts of a flower with their descriptions. 1. pistil divided into three parts: stigma, ovary, and style 2. stamen connects the stem to the flower 3. sepal green, leaf-like covers at the bottom of the flower 4.

If the gene for the glycolytic enzyme hexokinase is engineered to contain an skl sequence, what is the expected cellular location of hexokinase?

Badwater Basin in Death Valley is covered with white salt crystals. What is likely to be true of this area? A. The white salt crystals have a high albedo. B. The white salt crystals are immune to insolation. C.

Why does hurricane season occur from late spring through fall in the Atlantic region? A. Hurricanes need warm oceans waters to form B. hurricanes need the high air temperatures to form to form. C.

Earth's most recent era is the

During what process is water produced

Water, fuel, food, and raw materials are examples of what? A. regulating services B. cycling of matter and energy C. natural resources. D. cultural services

Which planet formed near the Sun where the solar system's temperatures were very high?