What is the greatest threat to plant diversity? a) Insects
b) graying and browsing by animals
c) pathogenic fungi
d) competition with other plants
e) human population growth

insect

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humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .