Answer: Mechanoreceptors
Explanation: These receptors perceive sensations such as pressure, vibrations, and texture.
A, turning on gene expression
Tiktaalik is a transitional fossil which shows how fish evolved into amphibians and reptiles. So the correct option is B.
What is Tiktaalik?
Tiktaalik is a direct ancestor of tetrapods or four-legged animals. It is an extinct fish-like animal and it lived on earth 380-385 million years ago (Devonian period).
The word Tiktaalik is derived from the <em>Inuktitut</em> language which loosely translates to large freshwater fish. This animal had characteristics of both fish and tetrapod and is therefore called the link between these two kinds of animals.
The characters resembling fish are gills and scales and the characters resembling tetrapods are rib bones, movable neck and lungs. There are characters that are a mix of both tetrapods and fish. These are bones and joints in limbs but fish-like fins instead of feet or hands.
Read more about Tiktaalik, here
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Answer:
The correct answer is option - protein.
Explanation:
T dependent or the thymus-dependent antigen is the antigen that depends on the T cells with B cell to produce specific antibodies. It is mediated by the MHC II molecules with T cells.
This type of antigen includes polypeptides, erythrocytes, and proteins, and other antigens. These antigens contain epitopes.
Thus, the correct answer is option - proteins
