What is the tough and flexible layer that surrounds plant cells as well as some algal and bacterial cells?

All of the following are problems caused by burning coal, except A) creates smog B) contribute to climate change C) contributes to acid rain D) radioactive waste is produced

Which statement best describes the events that take place within the mitochondrial membrane? O A. Electrons gain energy as they move. OB. The electron transport chain produces ATP. O C. The Krebs cycle breaks down glucose. O D.

The biome with the most diverse communities of organisms is the

As the nights get longer and the temperatures become cooler, some plants

Which of the following alternative energy sources in not inexhaustible

With severe deep frostbite of an extremity, the water should be at what temperature for re-warming

What flowering plants evolved during the Cretaceous period

Most jobs moved from the home to the factory and led to

Day and night are caused by Earth's revolution on its axis.

If one species in a community dies out or moves, the community will