troposphere

ionosphere

biosphere

envirosphere

Change the hypothesis to match the results.

Change the results to match the hypothesis.

Reject the original hypothesis and formulate a new hypothesis.

Accept the original hypothesis.

Because they cannot survive outside of the host, parasites are actually not considered alive.

Parasites are still considered alive because they are studied by biologists, and biology is the study of life.

As long as parasites are made of cells, they are considered to be alive.

Survival outside of a host is not a requirement for life.

the hypothesis that echinacea prevents cold symptoms is supported

the theory that echinacea prevents cold symptoms is proven

the hypothesis that echinacea prevents cold symptoms is not supported

the theory that echinacea prevents cold symptoms is disproven

A blind control, since the sick people do not know whether they are receiving the placebo or the Echinacea

A positive control, since you are expecting a change to happen in this control group

A negative control, since you are expecting no change to happen in this control group

Both a blind control and a negative control.

Scientists use the word theory to mean a hypothesis that has been supported by many experiments; this is the same way non-scientists use the word theory.

Scientists use the word theory to mean a hypothesis that has not been tested many times; this is the same way non-scientists use the word theory.

Scientists use the word theory to explain many observations supported by a large body of evidence; non-scientists use the word theory to state a guess.

Scientists use the word theory in the same way that they use the word hypothesis; both mean a general idea that remains to be well tested.

population

ecosystem

organism

community