Which of the following is an assumption made by the logistic model?
a. every individual has the same negative effect on population growth rate, independent of density.
b. populations that reach carrying capacity always experience a delay before the negative effects occur.
c. there are no other species competing for the same resources as the observed population.
d. there is no immigration or emigration of individuals occurring within the population.

Explanation:

Every individual has the same negative effect on population growth rate, independent of density.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.