Ascientific model is a simplified representation of a natural phenomenon. to be useful, a model must
accurately represent the components of the phenomenon as well as their relationships. a food web and
an energy pyramid are both scientific models.
the food web below shows the feeding relationships among several organisms in a meadow ecosystem
foxes
hawks
snakes
rabbits
shrews
small
- birds
bird
caterpillars
milkveed
crickets
g
rasses
assume that the amount of energy represented by the producers in this food web is 125,000 kilocalories
(kcal). in the box below, draw an energy pyramid that models the feeding relationships in the food web
write the name of each kind of organism in the correct trophic level. label che trophic levels, and sho
the amount of energy available at each level

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2

What are ways that ordinary people can to keep antibiotic resistance from getting worse?

Ms. w, a 21-year-old woman, came into a clinic after suffering a deep laceration on her foot while walking barefoot around her yard. the wound was cleaned, sutured, and bandaged, and she was released to return home after receiving tetanus antitoxoid. within 72 hours, the wound area was red and swollen, the suture line was dark in color, and it was accompanied by severe throbbing pain. ms. w had a high fever, her heart felt like it was racing, and she was finding it hard to concentraten even on simple tasks. she returned to the clinic and was immediately taken to the hospital. following lab tests, a diagnosis of acute necrotizing fasciitis was made. discussion questions 1. explain why ms. w. received a tetanus antitoxoid before leaving the hospital. (see chapters 3 and 4, infection and passive immunity.) 2. explain how acute necrotizing fasciitis developed in this case and the pathophysiology involved. (see acute necrotizing fasciitis.) 3. what is the potential outcome for ms. w if antibiotic drugs do not reduce the infection quickly?