Biology U9 Pt. 3

when nitrogen oxides are released into the atmosphere from burning fossil fuels, ___ occurs

acid rain

Which organisms are involved in primary succession?

bacteria, lichen, and mosses

The numbers and variety of different species in a given area is ___

biodiversity

The number of particular species that an ecosystem can support is the ___

carrying capacity

The final and stable community of an ecosystem is the ____

climax community

It is a process of change during which species in a community are established or replaced

ecological succession

a ___ species is very close to becoming extinct if protective measures are not taken

endangered

Which scenario best describes old-field succession?

grasses, shrubs, small trees, and large trees

Carbon dioxide is one of the gasses that traps heat in Earth's atmosphere, which is known as the ___

greenhouse effect

What are the hot spots of biodiversity on earth?

island coastal areas tropical rain forests

a species vital to an ecosystem

keystone species

In primary succession, ___ are very important organisms

lichens

Polluted runoff greatly affects which cycles?

phosphorous nitrogen

a ___ makes an area more livable for other species

pioneer species

the first plants and animals to inhabit a newly available ecosystem

pioneer species

The process of __ happens in locations where an ecosystem had not existed before

primary succession

The process of ___ happens where an ecosystem has already existed

secondary succession

Exponential population growth happens when:

there are plenty of resources no predators are present

a ___ species needs protective measures to keep their numbers from falling to low levels

threatened species