What is most likely the cause of the differences in the birds in the picture?
interbreeding
change in diet
mutations in DNA
mutagens in the environment

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.

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

If a young male's body is just beginning the process of producing sperm, when is it likely that he would ejaculate mature, viable sperm"