CHARACTERISTICS OF LIFE
A bacterium detects a sudden change in acidity and changes its movement. What characteristic is demonstrated?
Response to stimuli
Information directly seen, measured, or detected is called what?
Observation
What variable does the scientist intentionally change?
Independent variable
Are all mutations harmful?
No
What is a possible explanation that can be tested?
Hypothesis
A human body maintains a stable amount of glucose in the blood despite eating a meal. What characteristic is demonstrated?
Homeostasis
An explanation based on observations is called what?
Inference
What variables remain the same?
Controlled variables
True or False: individuals can evolve
False
Two species rely on the same organism for food. What concept describes their dependence?
Interdependence
A single-celled organism contains structures that carry out specific functions. What characteristic does this support?
Cellular organization
A student says the plant grew because it received more sunlight. What is this?
Inference
A student keeps the amount of water the same. What type of variable is water?
Controlled variable
What process favors traits that improve survival and reproduction?
Natural selection
Why would a scientist test several organisms instead of only one?
Interdependence
A person's body produces more red blood cells when oxygen levels remain low. What characteristic is demonstrated?
Homeostasis
A student observes that a wet sidewalk is dry several hours later. What is one possible inference?
Evaporation
A scientist tests fertilizer but changes fertilizer amount and water amount. What is the main problem?
Multiple variables
Why doesn't an organism develop a useful mutation simply because it needs one?
Mutations are random
What is A forest contains trees, fungi, insects, birds, bacteria, and other organisms that interact with one another.
Community
A bacterium uses nutrients from its environment to power cellular processes. Which characteristic of life is demonstrated?
Metabolism
A student observes that two plants differ in height and concludes that fertilizer caused the difference. What must support that conclusion?
Evidence
A student tests one plant with fertilizer and one without. What is a major weakness?
Small sample
Why is it more accurate to say populations evolve rather than individual organisms?
Changes across generations
What are the two types of scientific observations
qualitative
quantitative