Fill in the blank. the of animals is based on scientists' current understanding of the evolutionary history of living species. although they are radially symmetrical, echinoderms are more closely related to a human than to a jellyfish because they are

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.

The hematodinium parasite becomes less of a problem for the blue crab when the crab is very young. fishing is thriving in the region. the crab moves to less salty water. a significant percentage of the population is impacted.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water