Which of the following are materials or equipment used in this lab to extract dna?
mark all responses that apply.
a. centrifuge and sample tubes
b. centrifuges and micro pipettes
c. centrifuge, micro pipettes, warm water bath
d. liquid chemical solutions and cheek swab
e. inoculating loop and flame

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.

One of the reasons that stars are so large is because

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere