Guppies are small, tropical freshwater fish that display wide variation in coloration. some have bright splotches of blue, red, and orange, while others are quite drab and dull. research has shown that females prefer to mate with brightly colored males; however, this trait makes them more likely to be seen. guppies, like all species, must be able to both survive and reproduce in order to avoid extinction what is one factor that can affect what color trait is selected for a particular environment?

Mention true or false : a) cholera is marked by acute diarrhea and no urination. b)mosquitoes are the source of dysentery germs.

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.

Which of these is not a nucleotide base found in dna?