Question

1. using model 1 and the letters b, d, e, and i, write mathematical expressions to show the types of populations described below. note: use > for greater than and use < for less than.

a. a stable population (total number of organisms is not changing).
b. a declining population (total number of organisms is decreasing).
c. a growing population (total number of organisms is increasing).
model 2 - survivorship curves

1. refer to model 2.

a. what does the x - axis on the graph in model 2 represent?
b. which type of organism shows a steady decline in its population at all life stages?

Explanation:

a. The x - axis on a survivorship curve typically represents the life stages of an organism. In Model 2, the labels "Newborn", "Pre - reproductive", "Reproductive", and "Post - reproductive age" clearly indicate that the x - axis is showing the different life stages of the organisms.
b. A Type II survivorship curve shows a relatively constant mortality rate throughout all life stages, which results in a steady decline in population at all life stages. In Model 2, the Type II curve is labeled as "Rodents", so rodents show a steady decline in their population at all life stages.

Answer:

a. The x - axis represents the life stages of the organisms.
b. Rodents (Type II organisms).