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Answer:
c. Directional selection
Explanation:
There are three types of selection: stabilizing, directional and disruptive. Currently seed cracker finches show disruptive selection with respect to bills. In disruptive selection two extreme phenotypes are preferred in population over the mean phenotype. Here either, small or large bills are beneficial for birds so it is an example of disruptive selection.
If due to some climatic change all seeds would become hard, it would be more beneficial for birds to have large bills. Slowly nature will select for birds with large bills rather than birds with small bills. The selection now will shift to directional selection since only one of the extreme phenotypes is being favoured.
Out of the following given choices, the answers are;
morning stiffness in joints
swelling of joints soft-tissue swelling of at least three joints
Rheumatoid arthritis is the damage to the joint cartilage due to autoimmunity . This causes increased friction (hence wear and tear) of the bones at the joints. This causes pain at the joints and hence the subject is immobilized.
Answer:
distruptions of temperature, precipitation and winds are caused by patterns that shift back and forth irreguraly every 2 - 7 years
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