For this activity, you will research and create the following items for your ecosystem presentation. food web
Identify keystone species and explain why they are keystone species.
trophic pyramid
numbers pyramid
biomass pyramid

What are chlorofluorocarbons made of

List two limitations of natural selection

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