Definitions of ecology terms, example of an adaptation, heat exchange

(1) What is the difference between these terms: Ecotype and Polymorphism Cline and Ecological Isolates Homeothermy and Endothermy (2) Describe a specific example of an adaptation that helps an organism solve one specific environmental problem but makes a different environmental problem worse. (3) What are the two requirements of blood flow necessary for a counter-current heat exchange system to work? See attached file for full problem description.

Which of the three forms of natural selection produced this narrow range?

The entire range of annual precipitation that individuals can tolerate is fairly narrow. Which of the three forms of natural selection produced this narrow range? See attached file for full problem description.

Biology Questions

See attached file for full problem description.

Actual Growth Rate, Closest Biotic Potential.

See attached file for full problem description. 1. At which point is the actual growth rate of the population greatest? 2. At which point is the actual growth rate negative? 3. At which point is the logistically growing population growing at a rate that is closest to the biotic potential for a population of that size? 4. What does the hatched area represent? 5. Members of several species of desert shrub secrete chemicals from the roots that prevent other individuals from growing close to them. This is an example of ...? 6. A plant species that is strongly r-selected would likely ...? 7. The major factor determining the size of r in a species is ...?

Ecology

Abiotic Factors, Ecological and Crude Density. See attached file for full problem description.