Question 21 (2 points) suppose a new planet was found in our solar system that orbited with a semimajor axis of (average distance) 4.0 au from the sun. using kepler's third law, calculate its orbital period. 04.0 years o 8 years o 64 years o 128 years

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