Natural selection acts upon

A only recessive alleles

B alleles that are expressed

C only alleles that are the result of recent mutations

D only dominant alleles

What converts nitrogen into a usable substance during the nitrogen cycle? A. Consumers B. Decomposers C. leaches D. Nitrogen fixing bacteria

9. How does the body stop blood when the blood vessels are cut?

Compare and contrast the host tree and the parasite tree. Where do they match up? What are the differences?

What characteristic is shared by both inceptisols and entisols, the soils of flood plains? a. They both have well0developed soil horizons and profiles. b. Both are young and only beginning to develop horizons and a soil profile. c.

When taking blood pressure during exercise, instruct the client to grasp the bike handlebars or the handrails on the treadmill to facilitate the measurement?

Yellowstone National Park has an average of about 4500 bison living in it. The park covers 3472 square miles. What is the population density of bison living in Yellowstone?

The original regimen known as Pasteurization consisted of: 1. Heat at 100 degrees F for 60 minutes 2. Heat at 98.6 F for 30 minutes 3. Freeze at negative 32 degrees C for one hour following dessication 4. Heat at 62.8 degrees C for 30 minutes

Seedless plants can be vascular or non-vascular. True or False

What is the basis unit of structure and function of all living organisms?

Wrinkles and sagging skin in elderly individuals are the result of