If a star is 100 light-years away from earth how long does it take for its light to reach the earth?

Select one:

a. 100 years

b. half the number of light-years so the answer is 50 years

In a healthy ecosystem, many different species of animals may share the same habitat because they each have a different niche. an animal's niche is best described as

Sometimes aquaculture operations can lead to oxygen depletion near the benthos as organic matter is consumed.

Which base does NOT belong to DNA? Select one: a. Guinine b. Cytocine c. Adenine d. Uracil

What was the frist national park name and who established it

Secretions from the skin such as sweat protect the body because

A particular gene can have two forms, called alleles. which statement best describes the difference between the dominant allele and the recessive allele? (a) only the recessive allele is expressed when both alleles ate inherited.

Which of the following produce intrinsic factor? A. parietal cells B. zymogenic cells C. mucous neck cells D. enteroendocrine cells

What type of macromolecules is insulin

The one-toed horse of today steadily evolved from its five-toed ancestor. Which theory of evolution can explain this example?

The georgia supreme court ruled that a physician has a duty to take reasonable care to prevent a potentially dangerous patient from inflicting harm in: