revision

Scientists use observations and data to form and test

• constants.

• hypotheses.

• theories.

• conclusions

During an experiment, which factors are observed and measured?

• dependent variables

• independent variables

• constants

• hypotheses

The variety of life across the biosphere is called

• biodiversity.

• genomics.

• homeostasis.

• ecology

Similar organisms that can reproduce by interbreeding belong to the same

• ecosystem.

• environment. .

• habitat.

• species

Which phrase best describes scientific theories?

• explain few observations

• serve as speculations

• are never proven

• cannot be replaced

What is the name given for genetic changes in living things over time?

• adaptation

• homeostasis

• evolution

• negative feedback

A physical environment with different species that interact with one another and with nonliving things is called a(n)

• biosphere.

• ecosystem.

• habitat.

• adaptation.

Organisms rely on both negative feedback processes and behavior to maintain

• homeostasis.

• adaptations.

• ecosystems.

• evolution.

particle with a positive electrical charge

particle with a negative electrical charge