In a soil profile, which is the second layer?

A. parent rock

B. topsoil

C. subsoil

D. solid rock

The movement of alleles from one population to another is called

What processes enables lumber to be a self-maintaining renewable resource?

What is true of mass extinctions? A All life on Earth dies when a mass extinction happens B In each mass extinction, over 50% of animal species died. C Mass extinctions happen frequently. D There is no evidence for past mass extinctions.

According to adam smith, what role does individual self-interest play in directing human activity?

10. Which is (are) correct regarding DNA? a. C is paired with G. b. The sugar is deoxyribose. c. Hydrogen bonds exist between the bases. d. All of these are correct.

If an animal had 44 chromosomes in its sex cells, how many chromosomes total will they have?

Which system regulates and controls growth, development, metabolism, and reproduction? 1. endocrine system 2. lymphatic system 3. integumentary system 4. skeletal system

In photosynthesis what do the chloroplasts convert the energy of sunlight into?

State what scientists might do to successfully combat bacteria that are resistant to vancomycin

A population of snails exhibits two morphotypes - (i) dominant dark color [DD an Dd], and (ii) recessive light color [dd]. You observe in a population produces 25% homozygous dominant, 43% heterozygous, and 32% homozygous recessive.