the key element in the ecological concept of species is that individuals within a species can successfully interbreed and conceive healthy offspring
Answer:
14130
Explanation:
Logistic growth is a measure of continuous growth of a population of individuals in such an environment where the resources are limited. Such type of growth pattern has a characteristic growth curve which is S-shaped or sigmoidal.
The equation for logistic growth is as follows -
Change in population size = 
Where,
N = size of population
r = intrinsic rate of increase
K = carrying capacity
The values of r, N and K are given in the question as 12, 30 and 40 respectively.
So,

In the first stages of Alzheimer’s disease, the patient
affected may experience symptoms, such as memory loss of certain events. As the
time passes, the patient may experience long-term memory loses, the patient may
also revert into being a child. Patients who has been diagnose with Alzheimer’s
Disease are commonly diagnosis with pneumonia, which may lead to their death.
I'm pretty sure it's the cell membrane.