The theory of endosymbiosis states that 1.5bn years ago, some early eukaryotes (the ancestor cells of animals and plants) engulfed bacterial cells and kept them prisoner inside their cells. They did this so they could harvest the sugars that the bacterial cells were producing. The bacterial cells used light to produce sugars from carbon dioxide and water. Eventually, these engulfed bacteria became which type of organelles?

Patricia is told by her physician that her body and brain chemistry have physically adapted to the drug and that she has become dependent on the tranquilizers prescribed for her by another doctor.

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

How do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.