Which of these processes involve separation of grains?

A) Tilling

B) burrowing action of earthworm

C) Levelling

D) Both a nd b

Which would be least likely to pollute water with heavy metals

What role does natural variation play in the process of natural selection and, ultimately evolution?

What name is given to the process by which water crosses a selectively permeable membrane?

After a rapid change in climate, one population of bird quickly adapts to the change, but others in the area do not. what could you conclude about the quickly adapting population?

In which areas does acid rain most likely form before precipitating in locations downwind? A large cities with a high volume of smog B large cities with a low volume of smog C coastal cities that are not developed D small farming areas near lakes

How are solar cells different from most other power sources?

Determine whether each statement refers to the central nervous system or the peripheral nervous system.

Which of the following functions has a requirement for thiamin? Blood coagulation Formation of red blood cells Energy release from energy-yielding nutrients Formation of epithelial cell mucopolysaccharides

Why do viruses need living hosts, such as bacteria or eukaryote cells? A) The host cell is the source of food for the virus. B) Viruses depend on the host cells that they infect to reproduce.

3. Describe the directionality of RNA polymerase action. Include the terms: DNA template strand, DNA coding strand, DNA noncoding strand, mRNA, codons, 5'-3' and 3'-5'.