Which energy source contributes the largest percentage of total energy?
a. coal
b. petroleum
c. natural gas
d. nuclear energy
b
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What is the function of endosperm?
a. food for animal pollinators in flowers that don’t have nectar b. food for the sprouting seedling c. food for developing pollen grains d. food for the growing pollen tube e. food for the developing fruit
The last step of B cell activation is__________.
What will be an ideal response?
What is a photosystem?
A) Stacks of thylakoids B) A double-membrane organelle containing thylakoids C) Clusters of pigments and proteins that capture light energy D) A leaf or any green part of the plant
A line transect would probably be the preferred method to quantify the population density of
A. lions. B. blackbirds. C. swallowtail butterflies. D. clown fish. E. Ponderosa pines.