Genetic factors predispose some individuals to have lower levels of some neurotransmitters and lower reactivity in neural regions that activate in response to positive emotional stimuli. In turn, these unobservable characteristics have been linked to the behavioral expressions that we classify as depression. In this case, neurotransmitter abnormalities and neural reactivity abnormalities are

Sammi is studying the interaction of the digestive and circulatory systems in the human body. she has listed various processes that occur in each of the systems. put the processes in order to describe the interaction between these two systems. tiles nutrients diffuse through the villi of the small intestine.digestive processes break nutrients down in the mouth, stomach, and small intestine.blood is pumped through the circulatory system to deliver nutrients to other organs.nutrients are ingested at the mouth.nutrients enter the capillaries of the circulatory system. sequence

Which describes how weathering and erosion are different? weathering is caused by water. erosion is caused by wind and ice. erosion transports sediments. weathering is a natural process.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?