Why are many farmers encouraged to plant different types of crops on the same land throughout the year? A - It provides more food for other countries.

B - It allows for more genetic variation in plants.

C - It prevents insects from destroying crops.

D - It helps to preserve the quality of the soil.

d

Explanation:

it helps to preserve the quality of the soil

answer: wheres the options

explanation:

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.