Which best describes how the common cold spreads in the human body? A. Viruses lie dormant for many weeks without replicating.
B. Viruses inject DNA into bacteria, which are killed.
C. Viruses replicate outside of cells and then enter cells.
D. Viruses replicate inside a cell and then burst out of the cell.

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

Which sentence is an example of a strong conclusion to an autobiography? a. i stayed after school three days in a row to practice onstage in the auditorium. b. i knew i would have to practice all week to memorize my dance for the recital. c. after the recital was over, i knew practicing was worth it, and i was looking forward to my next big challenge. d. on opening night, i danced in front of a packed auditorium.

Classify the structures as homologous or analogous, depending on their structure and function.