The unifying theme in biology is

a. ecology
b. genetics
c. metabolism
d. evolution
e. taxonomy


Ans: d. evolution

Biology & Microbiology

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Of the four types of T cells, only the ____________________ T cells destroy infected body cells

Fill in the blank(s) with correct word

Biology & Microbiology

The internal skeleton of echinoderms is made of calcium-stiffened ____ that develop from mesoderm

a. ampullae b. ossicles c. radial canals d. ring canals e. madreporites

Biology & Microbiology

In what year did chemists begin developing synthetic toxins to protect crops?

a. 1865 b. 1900 c. 1925 d. 1945 e. 1960

Biology & Microbiology

Dead or damaged cells are replaced by the process of ________

A) fertilization B) binary fission C) meiosis D) mitosis

Biology & Microbiology