Unit 1
Which practices add to scientific knowledge?
Inferring, predicting and drawing conclusions
What are the basic structural units of all living organisms?
Cells
Which molecule is a pigment?
Chlorophyll
How are the ages of extinct organisms determined?
by studying the concentration of radioactive atoms in their fossils
What is learned behavior?
An activity or behavior that is acquired by an organism through experience
Which statement correctly defines the term scientific theory?
An explanation of observable phenomena
Which option identifies the theory that describes cells and how they operate?
Cell theory
Which human traits form a wide range of states instead of two distinct states?
Hair color
Define fitness.
an organism’s ability to pass on its alleles to the next generation
What is behavioral cycle?
A behavior that repeat at regular intervals.
A scientific theory can become a scientific law, but a scientific law cannot become a scientific theory.
True or false
True
When a person looks at an object, the sense receptors in the eyes respond to changes in what?
Light
Which traits are most likely controlled by more than one gene?
height ranging from short to tall
hair color ranging from light to dark
eye color ranging from light to dark
Explain the first known mass extinction?
The first known mass extinction is in Precambrian era. It was caused by oxygen. Oxygen was produced by some types of bacteria performing photosynthesis. This event wiped out most of the bacteria that did not use oxygen.
What is dormancy?
A state of inactivity in organisms, where growth and development are paused