When did the ocean begin to form?
a. 200 million years ago
b. 4.2 billion years ago
c. 5 billion years ago
d. 3.4 billion years ago
b
Biology & Microbiology
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The spread of toxin via circulation is called
A. septicemia. B. bacteremia. C. sepsis. D. toxemia.
Biology & Microbiology
Which statement is true?
a. Feathers are waterproof because they secrete cellulose. b. Trabeculae are small bones found in the wings. c. Both beaks and feathers are composed of keratin. d. Feathers help to radiate excess body heat.
Biology & Microbiology
The progression of species that would take place in an abandoned field is called ________
Fill in the blank(s) with correct word
Biology & Microbiology
To strengthen the conducting cells and help plants stand erect without water for them to float in, land plants developed
A) stomata. B) a cuticle. C) flowers. D) vascular tissue. E) lignin.
Biology & Microbiology