Solved by a verified expert:Question 9 (5 points)The principle that states that two different species cannot occupy the same niche in a given habitat is called what?Question 9 options:Pauli exclusioncompetitive exclusionmutual exclusionintraspecific competitionQuestion 10 (5 points)Which of the following statements about the sulfur cycle is FALSE?Question 10 options:Animals obtain needed sulfur by eating other animals or plants.The burning of fossil fuels results in the emission of a sulfur containing gas that contribute to acid rainCellular respiration is an important metabolic process that moves sulfur from living organisms into the atmosphere the sulfur cycleSulfur moves from the earth into the atmosphere during volcanic eruptionsQuestion 11 (5 points)What is the key difference between a foundation species and a keystone species in a given ecosystem?Question 11 options:A foundation species exerts the most influence on maintaining biodiversity while a keystone species is most abundant.A foundation species is usually the most abundant, and a keystone species exerts the most influence on maintaining biodiversity.There is no difference—the terms are used interchangeably.A foundation species is the least abundant, and a keystone species is the most abundant.Question 12 (5 points)Logistic population growth patterns are indicative of what?Question 12 options:limited resourcesunlimited resourcesa disruption of carrying capacityno competitionNitrogen is an essential element for plants, and most plants can only use certain forms of nitrogen. What are these forms and how do they become available in the soil?Question 13 options:ammonification produces ammonia (NH3); nitrification produces molecular nitrogen (N2)ammonification produces ammonium ion (NH4+); nitrification produces nitrate (NO3)ammonification produces ammonium ion (NH4+); denitrification produces nitrite (NO2-)nitrification produces molecular nitrogen (N2); nitrification produces nitrate (NO3)Question 14 (5 points)What is the structure of the reef ecosystem made of?Question 14 options:coral skeletonfish excretionshark teeththe chloroplasts of algaeQuestion 15 (5 points)After a disturbance such as a wildfire, an ecosystem will undergo changes until it reaches a state of equilibrium similar to its pre-disturbance state. The ecosystem is said to have reached what?Question 15 options:primary successionmutualismclimax communitysecondary successionQuestion 16 (5 points)Which of the following correctly identifies an abiotic factor influencing the distribution of biomes?Question 16 options:the amount and type of bacteria present in a given patch of soilthe total number of plant-eating insects in a given spaceelevation of a land mass above sea level*the total number of species in a given areaQuestion 17 (5 points)Which of the following statements about this food web are FALSE? Select all that apply.Question 17 options:This food web include examples of bird species that are both herbivores and carnivores.The snake is a primary consumer.The fox is a secondary consumer.The mushrooms are decomposers.The squirrel is at the first trophic level of this ecosystem.The frog is both a secondary and a tertiary consumer.Question 18 (5 points)Which of the following activities decreases greenhouse gases in the atmosphere?Question 18 options:Cutting down trees.Driving gasoline-powered vehicles.Using electricity from coal power plants.Planting trees.Heating your home with an oil furnace.The large majority of climate scientists say that the current rate of global warming is caused by elevated levels of gases in the atmosphere. Which of the following gases is primarily responsible for this problem?Question 19 options:Carbon monoxideCarbon dioxideNitrous oxideOxygenOzoneSulfur DioxideQuestion 20 (5 points)This is an ecosystem energy pyramid that illustrates how much energy is found at each trophic level of a food chain. Select all the statements about this pyramid that are TRUE.Question 20 options:Looking at the total amount of energy in an ecosystem, most energy can be found in the primary consumers. Looking at the total amount of energy in an ecosystem, most energy can be found in the producers.Approximately 10% of energy from one trophic level is transferred to the next trophic level.Approximately 90% of energy from one trophic level is transferred to the next trophic level.This energy pyramid explains why there are few tertiary consumers in most ecosystems.