Three types of threats to biodiversity are:
habitat loss and fragmentation the introduction of exotic, or non-native, species overexploitation, or overharvesting.
determine the type of threat that each of the following statements describes.
1. a wetland is drained to make room for a housing development.
2. south american rodents called nutria eat wetland plants and cause bank erosion in the united states.
3. some fishing nets damage the seafloor.
4. melaleuca trees from australia displace native wetland vegetation in florida.
5. small rainforest remnants have less diversity than larger rainforest remnants.
6. cod are caught faster than they can reproduce.
7. florida panthers were geographically cut off from other panthers about 100 years ago.
8. wild american ginseng populations have declined as a result of increased demand for the roots.

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.

The us council on environmental quality, the world wildlife fund of the united states, the ecological society of america, the smithsonian institution, and the international union for the conservation of nature have proposed four principles of wildlife conservation. which of the following does not apply to wildlife conservation? a) continuous monitoring, analysis, and assessment b) ecosystem maintenance that includes wildlife c) a plan encompassing entire communities of organisms and all renewable resources d) a continued interest in harvesting populations for sport

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)