All science begins with ________, which is the first step in the process known as the scientific method
Fill in the blank(s) with correct word
observation
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Mollusks are distinguished from other animal groups by the presence of (select all that apply)
A. a mantle that plays a role in breathing and excretion. B. a toothlike radula in some. C. a segmented body with a hydrostatic skeleton. D. ecdysis. E. none of these
How many types of histone proteins are there?
A. 4 B. 5 C. 7 D. 8
Which of the following stimulates spermatogenesis?
a. Gonadotropin-releasing hormone b. Testosterone c. Progesterone d. Luteinizing hormone
Sometimes plant species that grow in the same area cannot interbreed because their physical shape has become specialized for different types of pollinators. What type of reproductive isolation is occurring?
a. mechanical b. ecological c. behavioral d. gamete incompatibility e. temporal