Edited Invalid date
Chapter 150: Answers Explained
Choice D isn't correct because the danger that results from a food web most affects the highest trophic levels, not the lowest levels.
It's true that the lowest trophic level has the greatest biomass, and it's also true that radioactiveContamination to that level is horrible.
The initial radiationContamination of the lowest trophic level is a tiny fraction of the amount of radiation that works its way through the food chain from that level to the highest level.
The other choices don't make sense.
The circular shape is larger than the original and includes cooler temperatures.
Choices B and D show a circular shape moving to the right, which indicates greater precipitation.
It makes sense to look for an answer that includes both precipitation and temperature since the question described the steppes as "dry, cold grassland".
The amount of sunlight and the human population size are not defining characteristics of the biomes.
The variation in seasons, choice C, is an indirect result of latitude and altitude, but it is not a defining characteristic of biomes.
Choice D is incorrect because altitude is only one of several factors that determine the climate, and altitude and the water supply are not defining characteristics of biomes.
choice B is incorrect because there are no biodiversity hotspots in Europe.
Climate change and harmful human activities pose a constant threat to the species in the biodiversity hotspots.
The species in the hotspots are not common.
The answer must be choice B since the question focuses on wolves, deer, and elk.
All living and abiotic factors are involved in the ecosystems.
Choice C is incorrect because the question focuses on a community, not just a population.
The question does not solely focus on individuals, but on a community.
The taiga is located south of the tundra.
The tropical rainforest is closest to the equator and the temperate deciduous forest is south of the taiga.
The curve is flat in the beginning and then drops as you get older.
The highest mortality occurs early in life due to a lack of protective parenting, which is characteristic of external fertilization.
The initial flat line represents a low death rate among the young as a result of intensive parenting and the quick drop off represents death during old age.
R-strategists and K-strategists have their own characteristic survivorship curves that do not vary, so choice B is incorrect.
There is one line that represents the survivorship curve of an r-strategist.
The curve dips steeply initially.
Density-independent factors do not have to do with population density and include flooding, precipitation, and wind.
Losing a single species can destroy an entire system.
Choices A and D do not describe the most significant danger caused by an Invasive species.
The stem of the question doesn't give any information about the fungus spreading to humans.
Stable environments are favored by K-strategists since organisms are not being killed off by unfavorable conditions.
Competition for limited resources is minimized by this.
There is no way to know if the invader will eat the native nuisance plants and animals.
Choice B is incorrect because the seastar will not be a food source.
The invading species may kill off some native species and reduce the number of native populations.
Chemicals and oils that run into the lake foster the growth of algae.
The light is blocked and the light cannot be seen at the lower depths.
Thebacteria use up the oxygen in the water.
The situation can get so bad that it kills fish and other living things in the water.
The distribution of the population is shown by age and percentage.
The population of young people approaching reproductive age is getting larger and there are very few elderly people.
A large number of people in the future will have children if there is no law limiting the number of children a couple can have.
There is a large number of children who have yet to reach procreation age, which will lead to a larger population in the future.
Choice B has an even age distribution.
The population size will not change in the near future.
A population with a fairly even distribution is shown in Choice C, except for people in their 30s and 40s.
The group may have children in the future.
Choice D shows a large group of people in their 50s who did not have children.
There is a large group of people in their 30s who have not yet had a child.
The population will get smaller as shown in the graph.
Plants need nitrogen and phosphorus to grow.
Carbon and hydrogen are not harmful.
If the environment changes, the population has less chance of survival.
There can't be evolution without diversity.
There will be a lot of deadbacteria in the lake once it is killed.
The fish population is threatened by decomposition which uses up oxygen.
This change is brought about by human intervention.
There is no time for fish to acclimatize.
Review flashcards and saved quizzes
Getting your flashcards
Privacy & Terms