Using the terms b, d, i and e construct equations to express the following (b= birth d= deaths i= immigration e= emigration

a) a population in equilibrium
b) a declining population
c) an increasing population

a) b + i = d + e

b) b + i < d + e

c) b + i > d + e

Explanation:

Data provided in the question:

b = birth

d = deaths

i = immigration

e = emigration

Now,

a) a population in equilibrium

this means increase in population is equal to decrease in population

i.e

b + i = d + e

b) b) a declining population

this means increase in population is less than decrease in population

i.e

b + i < d + e

c) an increasing population

this means increase in population is increase in decrease in population

i.e

b + i > d + e

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

yes it is weird but true