BIO 100 FINAL SDSU ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS

BIO 100 FINAL SDSU ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS The study of the interactions between organisms and their environment. - Answer -Ecology 1. Individual organisms 2. Populations of organisms (same species) 3. Communities of organisms (different species that interact with one another) 4. Ecosystem (all living organisms that interact in a particular area) 5. Biosphere (all organisms) - Answer -At what levels of organization do ecologists work? Where populations are found on earth - Answer -Population Distribution 1. Abiotic (physical) factors. Non-living like temperature, geography, water availability. 2. Biotic factors (living) predators, parasites, competition of resource - Answer -What kind of factors determine distribution?Indicates size, The number of organisms per unit of area/volume (used when there is a great number of organisms in a population. - Answer - What is population density? B = Birth Rate D = Death Rate R = Population growth - Answer -What do r, b, and d symbolize and how are they related? Exponential growth: Population growth that is not hindered by a limiting factor. Growth without limits. Logistic Growth: Population size grows and decreases within the carrying capacity due to a limiting factor. - Answer -Compare and contrast exponential growth and logistic growth. Maximum population size that an environment can support. - Result of density-dependent factos - Birth and death rates change - growth rate changes - Answer -What is K? Density dependent: Lack of food, lack of space. Pretty much things caused by over-population/competition.Density Independent: Fires, floods, natural disasters, etc. - Answer - Define density-dependent factors and density-independent factors. 1. Type I - High survivorship until old age, then rapid decrease (humans and elephants) 2. Type II - Survivorship decreases at a steady, regular rate (birds) 3. Type III - High mortality in early life, but those that survive live long lives. (sea turtles) - Answer -What are the 3 types of survivorship curves? Predators lag behind the pray. When the amount of hares increase, the amount of lynx will increase because there is plenty of resources. However, if the lynx kill too many hares, there won't be enough resources and they will decrease. Less predators will then allow hare population to increase again. - Answer -Lynx-Hare Cycle Triangular = birth rates high, but death rates high as well. (Developing countries) Rectangular = Low Birth and death rates (slow growth) (industrial countries). - Answer -Population age pyramids (triangular vs rectangular) The changing of birth and death rates as a country goes from preindustrial to industrial to developed. - Answer -What is demographic transition?