When fatty acid molecules are in water, they can self-organize into a bilayer (double layer) that surrounds an inner core of water. Where "middle" refers to the middle of the bilayer between the outer and inner layers of fatty acids, which of the following statements is correct? A. The polar heads of the outer layer face the middle; the polar heads of the inner layer face toward the middle.
B. The polar heads of the outer layer face outward; the polar heads of the inner layer face toward the middle.
C. The polar heads of the outer layer face outward; the polar heads of the inner layer face toward the inner water core.
D. The polar tails of the outer layer face toward the middle; the polar tails of the inner layer face toward the inner water core.
E. The polar tails of the outer layer face outward; the polar tails of the inner layer face toward the middle.

The diagram below represents a marine food web and a process that can harm the human population. each circle represents an organism and the smaller dots inside them represent a toxic substance. what is being represented and how does it harm the population? the diagram represents biological half-life, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents biomagnification, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents the process by which different organisms prey upon each other; this can impact the human population by reducing the number of organisms that do not contain the toxin. the diagram represents the way that toxins are metabolized by living organisms, with those at greater trophic levels able to metabolize more efficiently than those at lower levels. this means that those at higher tropic levels are safer for humans to consume compared to the organisms at lower trophic levels.

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.

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp