Kevin is studying predator-prey interactions. One day he notices a spider eating a cricket caught in its web. Later that day, a bird eats the spider. Based on the organisms involved in this study, what level of organization is he studying?
What will be an ideal response?
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Answer the following statements true (T) or false (F)
1. Migration only occurs in vertebrates. 2. The main advantage of a territory is that it provides exclusive access to some resource. 3. Naked mole rats are haplodiploid. 4. Polyandry is the most common mating strategy.
Once a threshold is reached,
a. the number of sodium gates that open depends upon the strength of a stimulus. b. a graded local potential will be unable to spread to a trigger zone of the nerve membrane. c. the resting potential of a neuron is restored. d. the potassium channels in the input zone open. e. the opening of sodium gates and the accompanying flow of sodium ions is an example of positive feedback.
The ________ is a sheet of tissue that separates the outer ear from the middle ear
Fill in the blank(s) with correct word
Cephalization is
A. concentration of the sensory organs on the anterior end of the body. B. embryonic development of the head in advance of the rest of the body. C. a malformation of the head. D. an evolutionary degeneration of the head as seen in some parasites. E. concentration of the sensory organs on the posterior end of the body.