Need Help Urgent

1) Describe 4 processes/forces that can explain all mechanism in Organic Chemistry? My answers: a) Electron Delocalization b) Hydrogen Bonding c) Aromacity d) Nucleophilic Substitution (SN1 & SN2) Thank you!

1) Large/tough seeds act as a selection pressure on what trait? a. Large bills b.Large feathers c.Dark feathers d.Long tails 2) What causes the change in bill depth between 1976 and 1978? a.The lack of rain b.The persistence of only larger seeds c.Differe...

If 25 individuals were alive in 1955 and 500 existed in 2013, what is r? Show work please! a) 475 b)2.99 c)0.052 d)0.029

1) The probability of getting a certain disease is 0.2. A certain test is available which returns a positive result 90% of the time for those with the disease, and a negative result 75% of the time for those without the disease. Compute Pr{Test positive}....

I've got .39 for test positive, .61 for the negative test and .61 for the test positive/no disease but they were all marked as wrong so I was wondering if someone could help me with these questions? I used probability tree to find the right answers but it...

OK!!! Test Positive = .38 Test Negative = .62 Test Positive/no disease = ???? I've got the first two right but the 3rd one is still messing me up!