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The species extinctions taking place today are being caused by ___ activities.

atoms > molecules > cells > organisms > populations > communities > ecosystems > biosphere

Which of the following represents the most correct order of the organization of life from the smallest unit to the largest?


Which of the following organization levels is the least inclusive?

organism and nonliving things

An ecosystem such as a forest in the Pacific Northwest of the United States is made up of

the same species

A population is composed of individuals of

I, II, and III.

Which of the following characteristics are shared by all living things?
I. organization into cells
II. adaptation to environmental change
III. requirement of nutrients
IV. DNA housed in nucleus


Which of the following is a basic component of all of the others?

producers and consumers

All organisms fit into one of the two following categories

the unidirectional flow of energy and the cycling of nutrients

The dynamics of an ecosystem depends on two main processes:


On a very hot day in summer, you go outside and take your temperature, it is 37 degrees Celsius. On another day, this time a very cold day in winter, you go outside and take your temperature, again it is 37 degrees Celsius. This example illustrates

all of these except complex molecular structure

Living organisms are distinct from nonliving things by which of the following features?

with each energy transfer, some energy escapes as heat

Energy flow is one-way because

all of these

Homeostasis is

All of these statements are true

Which of the following statements is true concerning DNA?

bacteria, archaea, and eukarya

All known species can be grouped into three domains. What are they?

sunlight; carbon dioxide; water

Plants perform photosynthesis by using the energy of ___ to power production of sugars from ___ and ___ molecules.

Arachaea or Bacteria

You look into a powerful microscope and see a single-celled organism that is very small, has a cell wall, and no nucleus. You conclude that this organism belongs to the domain,

an oak tree

Which of the following organisms is a multi-celled producer?

genus; species

In the scientific name, Pan paniscus, Pan represents the name of the ___ while paniscus represents the name of ___.

all of these except e

The biological species concept developed by Ernst Mayr contains which of the following?


Which of the following words describes a tentative explanation to a given question?

perform experiments and/or make observations

In order to verify a hypothesis, scientists

observation; question; hypothesis; test; data; conclusion

What is the right sequence of events applied in the scientific method/

control group

An experimenter wanted to test the effects of cigarette smoking on rats. She infused the cages of 50 rats with cigarette smoke and the cages of another 50 rates with pure, clean air. The rats that received the clean air were the

report his or her results

The final step in the scientific method for a scientist is

experiments; test; hypothesis

Scientists perform ___ in order to ___ a given ___.

is an untreated group of individuals or subjects

A control group

it is unlikely to have occurred by chance

A result is statistically significant if

using a large sample

Sampling error can be minimized by one or more of the following.

it has a low probability of being skewed by sampling error

In science, if a result is deemed statistically significant, that means

variation in a set of data around the average

Error bars on a graph indicate

all of these are attempts to avoid bias

Scientists attempt to avoid bias by which of the following?

is widely accepted and supported by several evidences

A scientific theory


Evolution has been tested in various ways. Genetic, fossil, anatomical, physiological and behavioral studies all confirm that evolution is the mechanism of the origin of species. Thus, in science evolution is considered a scientific

an explanation that is well documented and consistent with the evidence.

In science, a theory is defined as

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