Vernon is studying the population of deer in a tract of forest. He gathers the
following data.
Birthrate: ~50 deer/year
Death rate: ~70 deer/year
Which additional observation would support the conclusion that the deer
population is NOT changing size from year to year, meaning that the net
population change is 0?
a. About 20 deer per year immigrate to the tract of forest.
b. About 20 deer per year emigrate from the tract of forest.
C. The average life span of a member of the deer population is 20 years.
d. If a deer survives its first year of life, its average life span is 20 years.

Ameadow ecosystem includes many species of grasses and small shrubs, several herbivores, and a few carnivores. a fungus colonizes the meadow and kills most of its vegetation. what is most likely to happen to the populations of herbivores and carnivores in the ecosystem? a. the populations of herbivores and carnivores will increase because there will be less competition for chemical energy. b. the populations of herbivores and carnivores will remain stable because the fungus cannot infect these organisms. c. the populations of herbivores will decrease because of vegetation loss, but the population of carnivores will remain stable. d. the populations of herbivores and carnivores will decline because less chemical energy will be stored in the ecosystem.

In the water cycle , when does water undergo a chemical change

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative