Explain the concept of a keystone species
What will be an ideal response?
A keystone species is (nearly always) a predator that has a great impact on the community in which it lives. This species affects the populations it preys upon, the populations it competes with, and is closely tied to species richness. In short, the keystone species structures the ecological community in which it resides.
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Nucleotides are joined together to make a nucleic acid strand by ____ bonds
a. phosphodiester
b. disulfide c. glycosidic d. hydrogen e. peptide
The alarm rings again; you hit the snooze button, but it is broken; you try to ignore the ringing, but that
sound is activating which of the following brain regions or functional groups of neurons?
a. limbic system b. reticular formation c. blood brain activator d. resonance tomography system e. hippocampus
Which soil type has the most minerals?
a. gravel b. sand c. clay d. humus e. silt
The differences between males and females of a species are called ________
A) sexual morphism B) male/female dimorphism C) sexual differentiation D) sexual dimorphism