Centimeter-thin layers of earth that are rich in iridium give evidence to support the

A. allopatric theory.
B. ecological isolation theory.
C. gradualism theory.
D. impact theory.
E. punctuated equilibrium theory.


D. impact theory.

Biology & Microbiology

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The NADH and the hydrogen ions produced in glycolysis must become __________ in the cytoplasm by donating its electrons to pyruvic acid.

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

Biology & Microbiology

If a gene is replaced with a heterologous sequence such that the gene is then nonfunctional, what is the result usually called?

What will be an ideal response?

Biology & Microbiology

When zygosporangia germinate, they must undergo ________ before forming hyphae

A) fertilization B) mitosis C) sporulation D) meiosis

Biology & Microbiology

A cell is often called the _____ of life.

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

Biology & Microbiology