Fossil Fuels, Coal, and Gold
I think the right answer is b
Answer:
1. Cell Wall
2. Amount of Vacuoles
3. Plastids
4. Size
5. Plasmodesmata
Explanation:
1. Animal Cells dont have cell wall, while Plant Cells do.
2. Animal Cells contain many/ multiple vacuoles, while Plant Cells only contain one.
3. Animal Cells dont have plastids, Plant Cells do have (eg. Chloroplasts)
4. Animal Cells are larger in comparison to Plant Cells
5. Animal Cells dont have plasmodesmata while Plant Cells do have.
Answer:
B) There is an increase in the number of giraffes with long necks in areas of Africa where low-growing trees have died
Explanation:
The directional selection is one of the ways of the natural selection in which the natural selection selects or favours the most extreme trait of the species and the extreme trait show higher fitness than the normal or average trait.
In the given question, the case of Giraffe necks shows directional selection as the normal length of the neck is not favoured by the environment but the extreme trait that is long neck is favoured by the environment and the selection shifted to that level.
Thus, Option-B is the correct answer.
