Cyanobacteria

question 90

Multiple Choice

Cyanobacteria

• A) first evolved about 2.5 billion years ago.
• B) are sensitive to extreme conditions.
• C) added carbon dioxide to Earth's early atmosphere.
• D) are multicellular organisms.
• E) require a warm environment to grow.

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Definitions:

Case Study

An in-depth investigation of an individual, group, event, or situation to explore causation in order to find underlying principles.

Naturalistic Observation

A technique of research that involves watching subjects in their natural habitats without any alterations made by the researcher.

Discretionary Income

Discretionary income is the amount of an individual's income left for spending, investing, or saving after taxes and personal necessities (like food and shelter) have been paid.

Positively Correlated

A relationship between two variables where an increase in one variable is associated with an increase in the other.