How long ago did oceans begin to form?

12.5 MYA

137 MYA

285 MYA

3800 MYA

7. the skeleton that protects the body's vital organs immune system

What type of microscope is used to look at microorganism

A community of biotic plus the set of abiotic factors that the community needs in order to stay alive is called what?

What are radioactive emissions and how are most humans exposed to them?

If an animal can not find enough places to build nest, it is beacuase is a limiting fctor for the population

If one link in the chain of infection is missing, an infection can still spread. True or false

4. How might similarities and differences in genetic codes, or the proteins built as a result of these codes, be used to determine how closely related different species are?

The presence or absence of horns in ruminant livestock species is determined by the polled gene. The polled allele (P) is dominant to the horned allele (p). What genotype (s) would result in an animal being polled (having no horns) ?

Name the function segment of DNA

Among the major atmospheric contaminants which is the only one that is increasing? what is the significance of this contaminant?