The Earth's core is made of an alloy of

A. iron and nickel.

B. copper and iron.

C. zinc and magnesium.

D. iron and zinc.

The organisms in a typical backyard are likely to include bacteria, grass, shrubs, trees, insects, spiders, birds, and small mammals. together, all these organisms make up

A substance that speeds up a rate of a chemical reaction I called

Charles darwin was not the only one to conceive of natural selection. who published an article suggesting current species were descended from other species?

An agriculturist plants legumes, which host the bacterium Rhizobium in their root nodules for nitrogen fixation. How will these legumes enrich the soil? Select the correct answer. A. they will overcome the deficiency of nitrogen in the soil. B.

2. Why is probability useful in biology?

How many years did the Precambrian Era span? 2.5 billion 5 million 5,000 none of the above

Explain why most quartz is useful?

What is the pattern of expression for autosomal genes?

The process by which the particles of a gas randomly pass through a tiny opening is called

What is an unusual defense some lizards have developed to protect themselves?