I have Kaplan's midterm and final, but don't have the answers. Can someone help me with a few questions I have? #13 from the midterm, A capillary has A. a higher hydrostatic pressure at the arteriole end and a lower hydrostatic pressure at the venue end. B. a higher osmotic pressure in its bolld plasma than the osmotic pressure of the interstitial fluid bathing the tissues. C. a hydrostatic pressure that results from the beating of the heart. D. A and C E. A, B, and C ---- Can someone point out the difference between hydrostatic pressure and osmotic pressure? Aren't they both referring to water pressure? #18 from the midterm, Birds nesting in trees are examples of which of the following types of symbiotic relationships? A. parasitism B. Commensalism C. Mutualism D. Predation E. None of the above #35 from the midterm, In the northerm hemisphere, to go from a coniferous forest ecosystem to a tundra ecosystem, you can travel: A. upwasrd in altitude only. B. upward in altitude and southwards in direction. C. northwards in direction only. D. downwards in altitude and southwards in direction. E. upwards in altitude and northwards in direction. --- I really don't like this type of question. Why do we have to know? Those of you who took DAT, did you have any questions relating to the climate? #11 from the final, Which of the following is involved in respiration and excretion, and develops into the placenta in humans? A. chorion B. allantois C. amnion D. yolk sac E. placenta --- Isn't chorion develops into the placenta? But, isn't it the allantois that have the blood vessels which develops into umbellical cords and is involved in respiration and excretion? Thank you so much for your time and support.