He types of living organisms on earth have changed over time-new species have originated and existing species have disappeared. this is an example of

Explain the importance of microbes. Distinguish between aerobic respiration and anaerobic respiration (fermentation). What two processes sustain ecosystems and the biosphere and how are they linked?

Which of these is a community? all of the Staphylococcus aureus (a species of bacteria living on your skin all of the organisms living in your home all of the people living in your neighborhood all of the nut grass (considered a weed) in your

Reproducing asexually has some major advantages including all the following except: a. rapid rate of reproduction b. ability to inhabit an area rapidly c. genetic variability d. no time spent on finding a mate

How high can creatinine and bun levels go before death?

Which of the types of T cells is responsible for destroying pathogens by punching holes in their cell membrane and by secreting cytokines/lymphokines?

Why would plants have pigments that are not photosynthetically active

Name and define the three main classes of symbiotic relationships. give examples of each

What is the most likely consequence of open pit mining on plant life? a. a dramatic reduction in the variety of plant species b. an increase in the number of plant species c. the complete loss of plant life in the area occupied by the surface mine d.

The body is unable to tell the difference between pathogen cells when attacked by an

What links the two strands in a DNA helix together in the middle?