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What are the main functions of the human skeleton? a exchange of gases b support and movement c sensing the environment d digestion and excretion

The biome pictured above is found in areas such as kenya and south africa. the land is grass-covered with very few trees and gazelles and other grazers are common here. why does this biome have a low population of trees? a) large grazing animals destroy the trees. b) it is a deforested rainforest with poor soil. c) it has high temperatures and low precipitation. d) it has a long rainy season followed by flooding.

If pressure and temperature remain constant, will the volume of gas in the respirometers increase or decrease?