Compare the features of a river near its source and far down along its course. I cant figure it out.

What is each level of consumption in a food chain called?

About 13 different species of finches inhabit the galápagos islands today, all descendants of a common ancestor from the south american mainland that arrived a few million years ago.

What structures in the cardiovascular system connect arteries to veins? A) valves B) heart C) capillaries D) lymph

Why type of molecules is fat? A) protein B) lipid C) nucleic acid D) carbohydrate

What of the following describes how an organism responds to external stimuli A. The human body reduces sweating when it's water levels are low B. a dog eats food when it is hungry C. A person yawns when oxygen is low in the lungs D.

One of the products of tryglyceride breakdown is glycerol; glycerol enters the cellular respiration pathway by being converted to glucose (in the liver) and then undergoing glycolysis.

More of solar radiation occurs with a higher angle of the Sun. absorption reflection evaporation roughness

What substance is made of protein

During which portion of the electrocardiogram do the atria contract

N a lab you are conducting tests with various chemicals and neurotransmitter receptors. you notice that exposed frog muscle cells depolarize when you add the chemical nicotine to the acetylcholine (ach) receptors.