Which of the following is NOT needed for genetic equilibrium to occur?
a) no natural selection
b) speciation
c) no genetic drift
d) no mutations
Answer: b) speciation
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Fossils of Cooksonia represent the oldest known fossils of vascular plants. Such fossils date to about
a. 1.5 billion years ago. b. 425 million years ago. c. 250 million years ago. d. 125 million years ago. e. 17 million years ago.
In which of these locations are salivary gland found?
A) side of the face below and in front of the ears B) the floor of the oral cavity C) roof of the oral cavity D) under the tongue.
Nitrogen can be returned to the atmosphere when certain bacteria convert it from nitrate into nitrogen gas, which is a process called ________
Fill in the blank(s) with correct word
Who demonstrated that cell-produced proteins called enzymes were responsible for chemical reactions in a cell?
Eduard Buchner Robert Koch Lazzaro Spallanzani Louis Pasteur