Which of the following was not evidence for the cause of the most recent mass

extinction?

a. Iridium b. Foraminiferan fossils c. shocked quartz d. lava flows

Predict which responses would occur in cells exposed to the a+b signaling molecules

How is dna similar to a recipe

In 1950's, Stanley Miller and Harold Urey showed how organic molecules necessary for the formation of life could be assembled from simple molecules known to have existed on Earth millions of years ago.

Mitosis and meiosis are both multi-step processes. Which statement correctly compares the number of stages in mitosis and meiosis? A. There are fewer stages in mitosis than there are in meiosis. B.

What happens to a molecule when its oxidized?

When an accurate experiment is repeated by another scientist, the results A) should be similar to those obtained originally. B) will be identical every time the experiment is repeated. C) should be completely different for a different scientist.

1. Which of the following forms all matter?

True or false Sedimentary rock can be formed from changes in igneous rock, but igneous rock cannot be formed from changes in sedimentary rock.

When a protein is denatured, why does it lose its functionality?

This is a rotating machine that converts the kinetic energy of the wind into mechanical energy. If the mechanical energy is used directly by machinery, such as a grinding stone, the machine is usually called a windmill.