Biology Module 5

When did the last mass extinction occur?

• 65 million years ago

• 56 million years ago

• 60 million years ago

• 50 million years ago

Natural resources are consumed at a lower rate in more developed countries than in less developed countries.

• True

• False

A _________ species can affect an entire ecosystem if it is declining in number.

• keystone
• endangered
• common
• invasive

Select three things that can affect the stability of ecosystems.

• natural disasters

• climate changes

• the activity of other organisms

• genetic mutations

• population growth

____ is the excessive use of species that have economic value.

• Underutilization
• Overexploitation
• Conservation
• Sustainability

Organize these options into the right categories

Groups:

(a) Renewable Resources

,

(b) Nonrenewable Resources

• wind energy

• coal

• animals

• petroleum

• oil

• clean water

• solar energy

• clean air

• mineral deposits

• natural gas

The gradual process of species becoming extinct is known as ______.

• spontaneous extinction

• background extinction

• gradual extinction

• evolution

______ is the increasing concentration of toxic substances in organisms as trophic levels increase in a food chain or food web.

• Biological magnification

• Biological degradation

• Biological diversity

• Biological accumulation

The number of different species and the relative abundance of each species in a biological community is called _______.

• species diversity
• species richness
• species abundance
• species variability

Entire species permanently disappear from the biosphere when the last member of the species dies in a process called ___________.

• extinction

• death

• bioremediation

• evolution