In the Pleistocene period 10,000 years ago, there was a remarkable extinction of vertebrates in many continents, which may explain why the cheetah has famously low levels of genetic variation. Which evolutionary mechanism does this reflect?

Where is the DNA located in a male sperm cell? A. In the sperms tail. B. On the outer membrane of the sperm cell. C. The sperm cell nucleus. D. The sperm cell inner membrane. What is the final destination of the sperm cell? * A. Another sperm cell.

Which of these methods would be more likely to create a waterlogged agricultural field that could decrease crop yield? A) Drip irrigation B) Flood irrigation C) Spray irrigation D) Furrow irrigation

When It rains? dissolves out of rocks so it can be used by plants, which then are eaten by animals.

An energy company wants to build a geothermal energy plant within a wildlife preserve. Which of these is a likely benefit to building a geothermal energy plant in this area?

Which is the role of restriction enzymes?

William is prescribed a drug from his doctor, and then prescribed a different drug from his dentist. he did not tell either doctor about the other prescription.

In New York State, cars are inspected to be sure they are not releasing excessive amounts of several gases into the atmosphere.

Many caves are formed by what kind of weathering

Why do your fingers leave prints when you touch something

Aluminum (Al) has an atomic number of 13 and an atomic mass of 27. Which of the following correctly shows the electron arrangement for aluminum? 1. 2, 11 2. 2, 8, 1 3. 2, 8, 3 4. 2, 8, 17