Select the correct answer. How do birds help the plant seen here reproduce? A. Burs attach themselves to the birds, which carry the burs away. B. Burs prevent birds from feeding on the seeds of plants. C. Birds don’t damage plants with lots of burs. D. Birds only make nests in trees with burs.

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.

Diagram of the evolution of land plants?

Amines amides and amino acids are categories of