Why might the Northern slopes of the mountains (facing the Mojave Desert) have more ecozones than the Southern slopes?

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

Control of the body is accomplished by which of the following body systems? nervous system and circulatory system endocrine and repertory system circulatory and respiratory systems nervous system and endocrine systems

When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?