3 a Why is it useful for crabs that live on the sea shore to have both lungs and gills.
b If equal volumes of blood go through the lungs and gills of light-blue
soldier crabs, suggest the mean percentage of oxygen that would be found in
the blood having gone through only the gills. Explain your reasoning.
c What does this tell you about how efficient both lungs and gills are in these
crabs?
d Suggest three reasons for this difference.

The graph shows the solubility of several different salts in water, across a range of temperatures. according to the graph, which salt can dissolve at a concentration of about 60 g/100 cm3 of water at 40 degrees celsius?

Hurry i need your (100 points) 1) what are the responsibilities of the region of the brain highlighted below? (picture located below) the highlighted portion is at the rear base of the brain, behind the brain stem. regulating homeostasis, hunger and eating, thirst and drinking, and many other functions of basic survival. coordinating movement and balance by using information from sensory nerves, including hand-eye coordination. controlling voluntary body movements, processing information from sense organs, thoughts, and learning abilities. regulating important involuntary bodily functions such as blood pressure, heart rate, breathing, and swallowing. 2)which of the following systems or structures is correctly paired with its function? neurons - brain cells that control thoughts, calculations, and memory cerebral cortex - portion of the brain that controls involuntary body movement peripheral nervous system - carries impulses to and from the central nervous system central nervous system - carries information from the nerves to the muscles and glands

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?