Question

13 multiple choice 1 point
distributions of species within a community can be
random
uniform
all of these answers are correct.
clumped
14 multiple choice 1 point
if a population exhibits a death rate that exceeds its birth rate, it is likely to _____
become extinct
increase in size
remain constant in size
decrease in size
15 multiple choice 1 point
the sage plant salvia leucophylla secrets a chemical that inhibits the growth of other sage plants nearby. considering this, what is the most likely pattern of dispersion one would find in the plants natural habitat?
none of these distributions is correct.
random
clumped
uniform

Explanation:

• Question 13: In ecology, species distributions within a community can be random (no predictable pattern), uniform (evenly spaced, often due to competition or territoriality), or clumped (grouped together, common due to resource availability). So all these are possible.
• Question 14: Population size change is related to birth and death rates. If death rate ($D$) > birth rate ($B$), using the formula for population change $\Delta N=(B - D)+\text{(immigration - emigration)}$ (assuming no migration for simplicity here), $\Delta N<0$, so population size decreases.
• Question 15: The sage plant secretes a chemical that inhibits nearby sage plants. This is a form of competition. Uniform dispersion often occurs due to competition (individuals keep a more or less equal distance from each other to access resources and avoid inhibitory effects of neighbors).

Answer:

1. all of these answers are correct.
2. decrease in size
3. uniform