Which type of curve will be for the coming century

Population termed $r$ - strategists

If natality is represented by $-B$

If mortality is represented by $-D$

If immigration is represented by $-I$

If emigration is represented by $-E$

If population density is represented by $-N$

Then population density at time $t+1$ is represented by

Which one is right for logistic model for population growth?

$I.$ Population growth rate increases as the size of population approaches the carrying capacity

$II.$ All individual have same effect on population growth

$III.$ There are unlimited natural resources

$IV.$ As population increases the competition goes on increasing

Select the correct combination

If natality rate is parallel to mortality rate then population