Biology in the 21st Century

At all levels of life, when related parts interact to form a whole they form a

• biosphere

• species

• cell

• system

Which statement best explains why the shape of teeth differs according to the diet of a species?

• Individuals parts must work together.

• Organisms interact with other organisms.

• Structure and function are related in biology.

• Organisms must maintain homeostasis.

The maintenance of constant internal conditions in an organism is known as

• homeostasis.

• negative feedback.

• structure specialization.

• adaptation.

Which aspects of life on Earth are accounted for by evolution?

• diversity and unity

• interaction and conflict

• lack of genetic and physical change

• divergence of structure and function

A beneficial inherited trait that is passed on to future generations is a(n)

• stimulus.

• adaptation.

• system.

• homeostatic mechanism.

Which word best describes a scientific hypothesis?

• provable

• theoretical

• testable

• quantifiable

At which stage of scientific inquiry would scientists find out if their hypotheses were supported by their data?

• observing

• testing hypotheses

• analyzing data

• evaluating results

In an experiment, the condition that is manipulated by a scientist is the

• independent variable.

• dependent variable.

• contant.

• control condition.

Which of the following is an important characteristic of a scientific theory?

• proven by more than one scientist

• unchanged by new evidence

• accepted by the public

• supported by much evidence

One way in which experimental research differs from observational research is that only experimental research can

• test a hypothesis.

• produce scientific results.

• support a theory.

• show cause and effect.