In sexual selection, what are the beneficial traits? a. traits that are the extreme form
b. traits that are shown by genetically related organisms
c. traits that attract potential mates
d. traits that are the intermediate form

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Which of the following statements is true? a. there are more chromosomes in an organism than there are genes. b. there are more genes in an organism that there are chemical bases. c. dna is made of sugar, phosphate, and carbon. d. genes are found in specific locations on a chromosome.

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels