A biologist studying a population of lizards on a remote island observes that the lizards' skin color varies significantly, ranging from very light to very dark, with many intermediate shades. The biologist determines that this trait is influenced by multiple genes. This type of genetic influence on the lizards' skin color is an example of what?

Which of the following pieces of evidence best supports the conclusion that identical genotypes can produce different phenotypes in response to varying environmental conditions, i.e., phenotypic plasticity?

A researcher studying a population of wolves notices that when food resources become scarce, the wolves exhibit increased territorial aggression and decreased reproduction rates. This observation best illustrates which ecological concept?

Calculate the average rate of increase in net primary productivity between year 3 and year 7.

What happens to herbivore populations if plant biomass decreases?

A study found that after repeated exposure to a non-threatening stimulus, an animal's response decreased. What is this learning process called?

Which of the following pieces of evidence best supports the existence of circadian rhythms in organisms?

A researcher is studying the relationship between body size and metabolic rate in mammals. How does body mass typically affect the mass-specific metabolic rate (metabolic rate per unit of body mass) in mammals?

After a volcanic eruption, lichens are the first organisms to colonize the barren rocks. This process is an example of:

A conservation biologist is analyzing the trophic cascade effects of kudzu invasion. Which scenario most accurately represents a secondary ecological consequence of kudzu dominance?

Which of the following conclusions is best supported by the evidence that a population of 500 individuals experiencing 150 births and 100 deaths in one season yields a growth rate of $$r = \frac{150 - 100}{500} = 0.1$$?

A study aimed at understanding the role of keystone species removes a suspected keystone species from an ecosystem and observes no immediate change in the ecosystem's structure. The researchers conclude that the species is not a keystone species. What conceptual mistake was made?

Using the benefit scores provided in the table, rank the following types of interspecific interactions from highest overall net benefit to lowest: Mutualism, Commensalism, Neutralism, Parasitism. (Enter your answer as an ordering separated by commas.)

A scientist studying insect populations in a seasonal forest observes that certain species enter reproductive diapause when day length decreases. Which of the following represents the most significant ecological advantage of this strategy in terms of energy dynamics?

A population of bacteria is grown in a chemostat where nutrient concentration is kept constant while waste products are continuously removed. What would typically happen to the steady-state bacterial population density if the flow rate of nutrients (and thus the dilution rate) is doubled?

In a study, plants were exposed to varying lengths of daylight. Some plants flowered while others did not. What is this response to changes in daylight called?

The invasive plant Alliaria petiolata (garlic mustard) releases allelopathic chemicals that disrupt mycorrhizal fungi associations with native plants. This mechanism most directly affects ecosystem dynamics by:

A study of coral reefs in the Caribbean showed a 50% decline in coral cover over 30 years, with areas near coastal development showing the most severe degradation. Which human activity most directly explains this pattern of ecosystem disruption?

After a forest fire, ecologists tracked the Simpson's Diversity Index in the recovering ecosystem over time. Which pattern would most likely indicate ecological succession is occurring?