1. In natural selection, Darwin proposed that evolution occurred because of the following conditions except 60

2. A sudden loss of black pigment from the skin of an African can be attributed to 56

3. A flowering plant having both male and female flowers on the same plant is said to be 25

4. In cold condition the mammalian body reacts in the following ways except 17

5. When a plant shoot is placed in a dye solution, under which of the following physical conditions will the dye move up the stem? 5