Which of the following statements about phylogenetic trees is true?
a. a paraphyletic group consists of a common ancestor and some of its descendants.
b. a monophyletic group consists of a common ancestor and some of its descendants.
c. a paraphyletic group has not experienced lateral gene transfer.
d. a paraphyletic group consists of an ancestral population and all of its descendants.

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 united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.