A wheat farmer is concerned that his land has been depleted of nitrogen. What steps can he take to make sure his wheat crops have enough nitrogen for the next season? Select all correct choices
A. He can plant alfalfa on his land and let it
serve as "green manure."
B. He can treat his land with man-made
fertilizers, thanks to Haber and Bosch.
C. He can continue to plant his wheat crops,
as wheat can form root nodules.
D. He can treat his land with phosphate
fertilizers.
A,B
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Which of the following are characteristics of arthropods?
1. protostome development 2. bilateral symmetry 3. a pseudocoelom 4. three embryonic germ layers 5. a closed circulatory system A) 1 B) 1 and 2 C) 1, 2, and 4 D) 2, 3, 4, 5 E) 2 and 3
The era during which the earliest signs of life appeared was the
a. Archean b. Paleozoic c. Mesozoic d. Cambrian e. Cenozoic
Bones are connected to other bones across a joint by
A) ligaments. B) tendons. C) osteocytes. D) cartilage. E) trabeculae.
What term describes an organism's physical appearance?