Which of the following statements best describes a vestigial structure? Group of answer choices

A tiger with a leg bone that is similar to that of a dog indicating they have a common ancestor.

A flower that has petals of different shapes and colors due to the presence of several codominant traits

A frog has developed an extra toe that it uses to grip larger food sources.

A fish species that lives in complete darkness and has eyes that do not function.

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

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.

Building glycogen from glucose molecules is an example of what