Theory

Theories can be modified with new ______.

• information.

• opinions.

• guesses.

• beliefs.

Why are scientific theories considered very reliable?

• They are based on opinions.

• They are based on experiments and observations.

• They are never changed.

• They are based on guesses.

If new data or observations conflict with a scientific theory, the theory is ________ or tossed.

• modified

• ignored

• accepted

• preserved

In Europe, Greece, what was the common belief about the origin of simple living organisms like worms, beetles, frogs, and salamanders?

• They evolved from other species

• They were created by a deity

• They spontaneously generated from non-living matter like dust and mud

• They were brought by aliens

Where did large numbers of frogs appear according to the passage?

• Along the flooded Nile River

• In the Sahara Desert

• In the Amazon Rainforest

• On Mount Everest

Based on the observation from 1000-1600 AD, what was a common result of sewage and garbage being thrown into the streets?

• Increased cleanliness

• Large populations of rats

• Decreased rat populations

• Improved public health

What was the first documented reproducible experiment on spontaneous generation?

• Francesco Redi's experiment in 1668

• Louis Pasteur's Experiment in 1559

• Lazarro Spallanzani's experiment in 1644

• Robert Koch's experiments on anthrax and cholera

Describe the method Francesco Redi used to cover half of the jars in Experiment 2.

• He used cloth to cover the jars.

• He used paper to cover the jars.

• He used metal lids to cover the jars.

• He used plastic wrap to cover the jars.

A well-tested concept that explains a wide range of observations is called a(an):

• hypothesis
• experiment
• cause and effect
• scientific theory

Who are the three scientists credited with creating the Cell Theory?

• Schlieden, Schwann, Virchow
• Lister, Koch and Pasteur

• Miller, Oparin and Huxley

• Redi, Hook, Virchow