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Question number one:
The correct answer is B
In the case of the starlings and their offspring, we can observe the workings of a stabilizing selection. (Presented in image number one).
Stabilizing selection tends to eliminate the extremes and favor the medium value of a trait, in this case, the number of offspring.
Question number two:
The correct answer is C.
In this example, we can observe the disruptive selection.
This type of selection favors the extremes and eliminates the medium values. In our examples with seed crackers, this means that the birds with large or small beaks are favored and the ones with medium sized beaks are eliminated. ( see image number two)
Question number three:
The correct answer is 2cm.
As we have seen on the graph number one, stabilizing selection tends to favor the medium values of a trait.
In the case of the acorns, the stabilizing selection will favor the 2cm circumference acorn, and after 10 generations we could expect the most common cicrumference to stay 2cm, because it was favored by the natural selection.
An electrocardiogram records the electrical activity of the heart.
Answer: Option A) inhibits
GABA is a neurotransmitter that inhibits postsynaptic activity
Explanation:
Gamma amino butyric acid, GABA, is an inhibitory neurotransmitter in that, once released to the synapse, it inhibits or check muscular contractions by suspending further activity of the adjacent motor neuron.
Thus, by this mechanism, GABA inhibits postsynaptic activity