Part 1 :

Please explain the function of the immune system in the human body, which organs it contains and What is the functions of these organs.

Part 2 :

Please explain the function and types of the immun system cells ( lymphocyte ) and what is the differancies of this cells .

a) Why do people invest in education? Discuss how individuals make these decisions using the human capital model and the signalling hypothesis.

b) How do these two models differ in their implications for policy makers with regards to subsidising education?

Compare and contrast hypothetical lipid composition in cells of the following organisms:

•Antarctic fish

•Human being

•Thermophilicbacterium in 100C hot springs

•Tropical plant

•Consider cholesterol content, degree of fatty acid saturation, and length of acyl chains

Cost-effectiveness analysis involves

a) clearly describing the costs and benefits of a policy proposal

b) Estimating the monetary values of costs and benefits

c) careful evaluation of the effectiveness of an established policy

d) cost-benefit analysis in the human services

The average human body contains 6.30 L of blood with a Fe2+ concentration of 1.60×10⁻⁵M . If a person ingests 9.00 mL of 13.0 mM NaCN, what percentage of iron(II) in the blood would be sequestered by the cyanide ion?

1.Are humans are REALLY naturally motivated by greed?

2.Which is better for society? Competition (relentless greed?) OR cooperative action?

3.Are the best measures of human progress really increasing value of commodities, and increasingly higher levels of consumption?

1. Explain the concept of “Carrying Capacity” and why it is important that the global human population does not exceed carrying capacity.

2. Define the term “Keystone Species”, and provide an example of a Keystone species, and how it relates to its particular ecosystem.