Of the three regions of a human kidney, which consists of renal pyramids?

In flowering plants, petals form when ____ genes are turned on

a. only A b. only B c. only C d. both A and B e. both B and C

The fluid portion of blood is known as blood ________; this portion constitutes approximately ________ % of the total blood volume

Fill in the blank(s) with correct word

Biologists currently recognize ________ different kingdoms.

Fill in the blank(s) with the appropriate word(s).

Obligate anaerobes may be cultured in the laboratory

A) in a reducing medium. B) in a standard incubator. C) in standard Petri plates. D) on blood agar plates. E) in standard complex media.