ES midterm 2020-2021

What does the line in this graph indicate?

• increase in mass over a certain number of years
• increase in mass over a certain number of days
• decrease in mass over a certain number of days
• mass of animals eaten by an anole

The group that does NOT have the independent variable applied to them and is used only for comparison is the

• control group
• experimental group
• qualitative data
• quantitative data

The factor in an experiment being changed by the scientist is:

• independent variable

• dependent variable

• control group

• hypothesis

The variety of living things in an area is referred to as

• genes

• biodiversity

• abiotic

• natural selection

Higher biodiversity leads to....

• a more stable ecosystem

• a less stable ecosystem

• it does not affect ecosystem stability

___________ species are at the highest risk of extinction.

• endemic

• threatened

• endangered

• invasive

Why are invasive species a threat to biodiversity?

• they can outcompete native organisms for their resources

• they can cause harm to the environment

• they change natural food webs in the ecosystem

• all statements are true

_____ species is a non-native plant or animal introduced accidentally or intentionally by humans

• keystone

• endangered

• threatened

• invasive (exotic)

Which is NOT an abiotic factor:

• soil

• air

• bacteria

• water

What percentage of energy is passed on to each tropic level?

• 10%
• 50%
• 90%
• 100%