Which best explains the evolution of gymnosperm plants
A. They evolved along with monocots and dicots
B. They evolved after the seeded flowering plants
C. They evolved after the seedless vascular plants
D. They evolved before the seedless non vascular plants

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

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.

Explain why biological control methods are generally environmentally superior to chemical pest control methods.