Most of the world's food supply comes from
A) wild plants.
B) only 12 plant crops.
C) more than 100 rain-forest species.
D) salt-tolerant crops.
E) frost-resistant crops.
B
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The advantage of having a double circulation is that the ventricles may act as two pumps with an ability to deliver blood at different pressures. Which animals exhibit a "double circulation" and four-chambered hearts? Check all that apply.
_____ humans _____ dogs _____ crocodiles _____ frogs _____ birds _____ turtles
When a rabbit eats the lettuce in your garden, the rabbit uses all of the energy in the lettuce
Indicate whether the statement is true or false
Which substance will help in seed germination and indicates to the plant that the stem must elongate to reach the light?
What will be an ideal response?