Genes that are highly conserved are
A) found in a wide range of species.
B) repeated many times in a genome.
C) found in humans only.
D) deleted by natural selection.
A) found in a wide range of species.
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Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because _____
A) sterilized soil kills the root hairs as they emerge from the seedling B) the normal symbiotic fungi are not present in the sterilized soil C) sterilization removes essential nutrients from the soil D) water and mineral uptake is slower when mycorrhizae are present
You are SCUBA diving in deep water and accidentally cut yourself. Your blood appears blue. Why?
A) Blue light is filtered out at this depth. B) Your blood changes color due to the pressure at this depth. C) Red light is filtered out at this depth. D) Oxygen has been pressurized out of your blood at this depth.
If a tree 50 meters (m) high has 30,000 leaves, the surface area of the leaves is 300 m2, and the amount of ground covered by the tree's canopy is 75 m2. The leaf area index (LAI) is
A) 4. B) 6. C) 100. D) 400.
The respiratory system is comprised of the respiratory tract and the accessory organs.
a. true b. false