the gross primary productivity of an ecosystem is 3.5 kgc/m2/year, and the energy needed by the producers for their own respiration is 3.0 kgc/m2/year. what is the net primary productivity of such an ecosystem?

What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.

Rue or false siblings look simila rbecause they each have some traits of their parents.

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in