Following fertilization, if a ball of embryonic cells splits into two masses before differentiation has begun, ________ twins result
Fill in the blank(s) with correct word
identical
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"Double fertilization" produces nutrient tissue by the union of ____
a. two egg nuclei and one sperm nucleus b. two sperm nuclei and one egg nucleus c. two sperm nuclei and two egg nuclei d. one sperm nucleus and endosperm mother cell nuclei e. two sperm nuclei and one endosperm mother cell nucleus
The cell junction labeled "B" in the figure
a. prevents movement of materials between cells. b. allows passage of a signal to contract heart muscles. c. allows the free passage of materials between cells. d. is found mostly in stomach tissue. e. is found in most tissues except heart muscle.
The Nearctic realm is designated by
a. A. b. B. c. C. d. D. e. E.
Selection is the differential reproduction of genotypes, resulting from their variable fitness
Indicate whether the statement is true or false