check your understanding 1. which of these abiotic factors would contribute to a clumped dispersion pattern in an ecosystem? select all correct answers. □ a. unlimited water □ b. limited water □ c. high temperatures □ d. moderate temperatures □ e. ample rainfall □ f. limited rainfall 2. an antelope population has a negative population growth rate. which of the following conditions must also be true for the population growth rate to be negative? o a. births + deaths immigrations + emigrations o c. births + immigrations deaths + emigrations 3. a population of yellow warblers, a type of songbird, experiences a period of exponential growth. which of these factors would be a density- dependent limiting factor that could decrease the carrying capacity of the ecosystem for this population of songbirds? o a. a competing species moves into the forest o b. a period of lower than normal rainfall o c. a developer fills in a wetland to build an office park o d. high winds knock down a quarter of the trees

Question

check your understanding 1. which of these abiotic factors would contribute to a clumped dispersion pattern in an ecosystem? select all correct answers. □ a. unlimited water □ b. limited water □ c. high temperatures □ d. moderate temperatures □ e. ample rainfall □ f. limited rainfall 2. an antelope population has a negative population growth rate. which of the following conditions must also be true for the population growth rate to be negative? o a. births + deaths < immigrations + emigrations o b. births + deaths > immigrations + emigrations o c. births + immigrations < deaths + emigrations o d. births + immigrations > deaths + emigrations 3. a population of yellow warblers, a type of songbird, experiences a period of exponential growth. which of these factors would be a density- dependent limiting factor that could decrease the carrying capacity of the ecosystem for this population of songbirds? o a. a competing species moves into the forest o b. a period of lower than normal rainfall o c. a developer fills in a wetland to build an office park o d. high winds knock down a quarter of the trees

Accepted Answer

1.
# Brief Explanations:
Clumped dispersion occurs when resources are limited. Limited water ($b$) and limited rainfall ($f$) mean organisms cluster around the available water sources. Unlimited water ($a$) and ample rainfall ($e$) would not cause clumping as resources are abundant. High ($c$) and moderate ($d$) temperatures are not directly related to clumped dispersion in the context of resource - based clumping.
# Answer:
B. limited water, F. limited rainfall

2.
# Brief Explanations:
The formula for population growth rate is $Population\ growth\ rate=(Births + Immigrations)-(Deaths + Emigrations)$. If $Births+Immigrations<Deaths + Emigrations$, the population growth rate is negative.
# Answer:
C. births + immigrations < deaths + emigrations

3.
# Brief Explanations:
A competing species ($a$) is a density - dependent factor. As the population of yellow warblers grows, competition with the new species for resources (like food, nesting sites) will increase. Lower rainfall ($b$), filling a wetland ($c$), and high winds ($d$) are density - independent factors as they do not depend on the size of the yellow warbler population.
# Answer:
A. a competing species moves into the forest

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