You notice that a flashlight is not working. What step in the scientific method is the following: Is the flashlight not working because the batteries are dead?

Question

If you notice that a flashlight is not working and guess that the battery may be dead, what step in the scientific method is this guess?

Hypothesis

There are other planets in the universe that are inhabited by life. Does this statement meet the criterion for hypotheses?

This hypothesis is testable, but not falsifiable.

If we launch exploration missions to Mars and do not find life, have we disproved the hypothesis that there are other planets in the universe that are inhabited by life?

no

In Francesco Redi's controlled experiment with meat and flies, what were the control conditions: the covered or uncovered meat?

uncovered meat

Spallanzani boiled broth in a flask and sealed it before it cooled. It did not grow microorganisms. Needham said this wasn't evidence that spontaneous generation did not occur, because the flask lacked _________.

oxygen

Which flask was most effective in discrediting Spontaneous Generation?

the flask with the S-shaped neck that allowed oxygen to enter but not microorganisms

Which statement defines the concept of spontaneous generation?

Living organisms can arise from non-living material.

Which of the following is a characteristic of living things?

They evolve from other living things

Each experimental set-up is designed in a pair. In one of the pair nothing is altered, in the other only one thing is changed. The name of the set-up that is altered is the _________ group.

expiramental

What is usually the first step in the scientific method?

observation

Aliens visit the Earth, but leave no sign of their presence. Does this statement meet the criterion for hypotheses?

This hypothesis is neither testable nor falsifiable

Which answer is NOT true for the source of the organisms that grew in the broth in the Spontaneous Generation Experiments?

Dust particles made up of non-living material have the ability to generate living microorganisms.

Each experimental set-up is designed in a pair. In one of the pair nothing is altered, in the other only one thing is changed. The name of the set-up that is not altered is the _________ group.

control

Which of these is NOT a characteristic of all living things?

Requires oxygen to breathe

A(n) _____________ in the scientific method means that the evidence solidly supports a wide group of related phenomenon (and no scientific evidence refutes it).

theory

You notice that a flashlight is not working. What step in the scientific method is being used if you replace the batteries to see if the flashlight will work?

experiment

Dogs are descended from wolves. Does this statement meet the criterion for hypotheses?

This hypothesis is testable and falsifiable.

In John Needham's experiment he boiled broth and placed it into a flask that was then sealed. If microorganisms grew in the sealed broth, what was the logical explanation for his experimental results based on what we know today?

The broth became contaminated when it was placed in the flask.