1. which of the following traits is not characteristic of animals?
multicellular body structure
composed of cells with cell walls
heterotrophic food-getting pattern
composed of eukaryotic cells
2. which of the following describes the most important difference between invertebrates and vertebrates?
vertebrates contain multiple tissues, while invertebrates do not.
invertebrates contain multiple tissues, while vertebrates do not.
vertebrates contain a backbone, while invertebrates do not.
invertebrates contain a backbone, while vertebrates do not.

Microorganisms aren’t all decomposers; in fact, many act as producers or primary consumers in an ecosystem. how do microorganisms that act as producers benefit the rest of an ecosystem in terms of energy transfer? what about microorganisms that act as primary consumers?

The model illustrates a process by which a substance is taken up by a cell

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.