An action or change in behavior that occurs as a result of a stimulus.

The most common chemical in cells is ___________, which is essential for life.

Means becoming larger

_______________ is change that leads to maturity

All organisms need ________ to power their cells.

Some organisms, called __________, can get energy from sunlight in a process known as photosynthesis.

Some organisms, called ___________, get energy by eating other living things.

A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce.

The process of grouping things based on their similarities.

A taxonomic category that names a group of similar, closely related organisms

The scientific study of how living things are classified.

The most basic level of organization in the classification of organisms.

Change over time; the process by which modern organisms have descended from ancient organisms.

___________ includes the familiar kingdoms of plants, animals, and fungi.

A less familiar kingdom, _____________, has much simpler organisms that contains a group of one-celled organisms without nuclei in their cells.

___________ have only one cell and no nucleus, but have different structures and chemical processes from those of Archaea.

_____________ is the idea that some individuals are better adapted to their environment than others. The better-adapted individuals are more likely to survive and reproduce than other members of the same species.