A factor that determines carrying capacity is called a a) determining factor c) niche limit
b) limiting factor d) habitat limit

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

What goes in and out of a cell respiration?