What does the presence of a vestigial structure in a modern organism indicate?

a
Natural selection prepares the body of organisms so that, in the future, the vestigial structures may be used.
b
The vestigial structure was not used by the modern organism, so it became nonfunctional within the organism's lifetime.
c
A limited number of genes are expressed during the lifetime of an organism.
d
The structure was probably functional in some ancestor of the modern organism.

At the complete end of cellular respiration, how many molecules of atp are produced?               a.  15    b.  26    c.  38    d.  34 

Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.

Describe how a non-resistant staphylococcus aureus bacterium can produce a bacterium that is resistant to methicillin