Which type of organism is responsible for performing the majority of nitrogen fixation ... ?

A. Humans

B. Aquatic organisms

C. Plants

D. Bacteria

Which is the lowest level of organization in the enviornment? population organism species community

Which of the following represents examples of abiotic factors in an ecosystem? A. the diversity of species of grasses found in a farmer's hayfield B. population of red-winged blackbirds in a cattail marsh C.

N Which best describes a centromere? O sister chromosomes that are held together by a chromatid paired chromosomes that have genes arranged in the same order the part of a chromosome that joins the sister chromatids the material that makes up a

During dna replication, a thymine base is removed from the dna. what type of mutation is this?

What do all seed plants use to reproduce

What does low white blood cell count and low neutrophils mean?

A. Many parts of the brain appear to have no useful function in today's world. b. Losses of small areas of certain parts of the brain rarely cause devastating, often permanent, losses of function. c.

Which of the following states was not a member of the Confederacy?

A sand bar that completely crosses a bay, sealing it off from the open ocean, is called what

Plant morphologist have developed a hypothesis that leaves are flattened stems between which tissue has developed? True or false