Which of the following substances ususally exits in the liquid state on Earth?

a. nitrogen

b. mercury

c. iron

d. none of the above

Which is a weakness of traditional food webs when they are applied to complex ecological problems? A) A food web does not represent all the links in an actual ecosystem.

Which best describes the trophic level of a an organism

Which is an element Ca NaCL AgNO3 CO

In New Zealand, fishing limits for orange roughy are monitored each year. If research shows an increase in the population of orange roughy, catch limits are increased the following year. If fish numbers are reduced, catch limits may be reduced.

How the structure of each of the biological molecules leads to their function?

Rosa has a vegetable garden. She places earthworms, which are decomposers, in the garden soil. What is Rosa most likely trying to do? A. prevent insects from eating the plants B. create usable food energy for the plants C.

A transposable element (TE), or transposon, is a __ sequence that can change its __ within a genome, sometimes creating or reversing mutations and altering the cell's __.

How a biologist's reseach can proceed from an idea to a published article

How many times do the nostrils of a frog open and close in one minute

What regulates the enzymes present in an organism A. Phenotype B. Genotype C. Proteins D. Carbohydrates