Why is it summer in the southern hemisphere when it is winter in the northern hemisphere

a: because the northern hemisphere has more direct sunlight
b: because the southern hemisphere has more direct sunlight
c: because the southern hemisphere has is closer to the equator
d: because the southern hemisphere receives indirect sunlight

Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel