B & E
Step-by-step explanation:
A logistical curve is S-shaped, unlike the exponential curve that is J-shaped. The logistical curve is the more natural population curve while the exponential curve is rare. This is because the population growth and numbers are always limited by environmental factors such as space, food, diseases, and etcetera. The maximum population numbers that a habitat can accommodate sustainably is called the carrying capacity. When population approaches the carrying capacity the growth in the population levels off hence the S-shape of logistic curves