What should you do before measuring liquid volume with a graduated cylinder?
1. line it up with the object to be measured.
2. determine the value for each marked line.
3. wash it to stop a meniscus from forming.
4. divide the liquid volume into 10 parts.

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.

Are gametes exactly the same? explain why or why not?

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?