Question

1. pyramid diagram with snake, mice, plants

a. depicts feeding connections in an ecological community
b. the amount of energy in the universe
c. the layout of organisms in any order seen fit.
d. the amount of energy at each trophic level
__19. if a population’s age structure diagram looks like the one below, the population is:
population distribution for angola in year 2012
males females
chart: pyramid - shaped age structure, wider at bottom, narrower at top
a. population is expanding rapidly
b. population is remaining the same
c. population will contract for at least a generation
d. population is showing generations of continuous exponential growth

Explanation:

Question 18 (about the pyramid diagram with snake, mice, plants)

The pyramid has different trophic levels (plants at the bottom, mice, then snake). A trophic pyramid (or energy pyramid) shows the amount of energy at each trophic level, with producers (plants) having the most energy and top predators (snake) having the least. Option a is a food web (shows feeding connections), option b is incorrect (energy in the universe isn't depicted here), option c is incorrect (it's a trophic/energy pyramid, not random layout). So the correct answer relates to energy at each trophic level.

An age - structure diagram with a wide base (more young individuals) and narrow top (fewer old individuals) indicates a rapidly expanding population. This is because there are many individuals entering reproductive age, which will lead to more births. Option b is wrong (base is wider, not stable). Option c is wrong (expanding, not contracting). Option d: exponential growth is continuous, but this pyramid shows a typical expanding population (not necessarily continuous exponential over generations, but rapid expansion now). So the population is expanding rapidly.

Answer:

d. The amount of energy at each trophic level

Question 19 (Angola's 2012 age - structure diagram)