Can someone help me with this

Why is the continuous presence of police officers and vigilant members of the public an ineffective crime prevention strategy? *criminology*

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.

Physical needs include: a. the need for sleep b. the need to feel safe c. the need to feel secure d. all of the above