A theory is a(n)
A) idea that has been proven.
B) concept in the early stages that still needs to be tested.
C) description of a belief that invokes the supernatural.
D) explanation of an idea that is broad in scope and supported by a large body of evidence.
Answer: D
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If all the offspring of a cross have the genotype Aa
Bb, the parents of the cross will most likely be a. AA BB x aa bb. b. AA bb x aa BB. c. Aa Bb x Aa Bb. d. Aa bb x aa Bb. e. AA BB x aa bb or AA bb x aa BB.
The gray crescent region of the amphibian zygote is thought to contain:a
growth factors and developmental determinants. b. hormones and ribosomes. c. yolk and dark pigment granules. d. mitochondria and ribosomes. e. neurotransmitters and hormones.
________ protein can be produced from waste materials such as molasses or petroleum by-products to be used as a food.
Fill in the blank(s) with the appropriate word(s).
Ram ventilation is used by ________ during respiration.
A. whales B. salamanders C. tuna D. frogs E. penguins