Scientists estimate that 90 percent of the wading birds that once inhabited Florida's salt- and freshwater bodies are gone due to various human activities. Why is this loss of biodiversity important? Give one specific example of how an ecosystem can be affected by the depletion or loss of a bird species.

The body is protected against harmful flu viruses by

Which of the following statements about c4 carbon fixation is not true? a c4 carbon fixation is an adaptation for plants exposed to high light intensityb. c4 carbon fixation occurs in more plants than c3 carbon fixation.c c4 carbon fixation is more common in areas of high temperatures than c3 carbon fixation.d. c4 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain