If pore space comprises 60% of the total volume of a soil and half of this pore space is filled with water, how much of the total volume of the soil will be filled with air?

a. 30%

b. 40%

c. 50%

d. 60%

When examining rock layers, where do you find the oldest material? Why is this the case?

Which of the following statements about homeostasis is FALSE? Which of the following statements about homeostasis is FALSE? Intrinsic control mechanisms maintain the extracellular fluid in a constant state.

A student listed some of the characteristics related to the phosphorus cycle. Which characteristic is incorrect?

The united states uses which sources of energy to produce almost 40 percent of its electricty?

Explain the difference between respiration and breathing?

NASA has published a list of criteria for identifying fossil bacteria in samples from Mars, as part of a search for evidence of life. Which of the following is good evidence for the presence of bacterial cells? a. The cell size of 0.5 to 2 microns b.

How much rain does a dessert get each year?

Select the correct answer. in a family, the father is affected by a genetic disorder. The son in the family has the same disease, but the daughters do not have it. What type of inheritance is this? A. Y-linked B. X-linked C. Polygenic D. Codominant

Which of these is a heterozygous genotype? Select one: a. Tt b. TT c. ta d. tt

What is the final outcome of meiosis