Question

1 what is an ecosystem?
a. all abiotic factors in an area.
b. a group of organisms belonging to the same species that live in the same area and interact with one another.
c. all the populations of living organisms in an area and the non - living aspects of the environment.
d. the populations of different species that live in the same area and interact with one another.
2 which of the following parts of the picture below are biotic factors?
a. soil, mushroom, tree
b. soil, sunlight, river
c. deer, mushroom, tree
d. sunlight, river, deer
3 a group of gray wolves living in minnesota is an example of...
a. community
b. population
c. biome
d. ecosystem
4 a balanced community of living organisms and nonliving components in a particular environment means that the ecosystem has...
a. equilibrium
b. disequilibrium
c. homeostasis
d. entropy
5 a neighborhood has 20 houses and in each house there is an average of 3 people per house. this is an example of...
a. population size
b. population genetics
c. population density
d. population migration

Explanation:

1. An ecosystem includes all living organisms (biotic) and non - living (abiotic) components in an area. Option c correctly combines living organisms (populations) and non - living aspects (environment).
2. Biotic factors are living things. Deer (animal), mushroom (fungus), and tree (plant) are all living. Soil (a), sunlight (b), and river (d) have non - biotic elements.
3. A population is a group of the same species in an area. Gray wolves (same species) in Minnesota fit this. Community (a) is multiple species, biome (c) is a large area with similar climate, ecosystem (d) has biotic and abiotic.
4. A balanced ecosystem has equilibrium. Homeostasis (c) is for organisms maintaining internal balance, disequilibrium (b) is imbalance, entropy (d) is disorder.
5. Population density is the number of individuals per unit area (here, per house). Population size (a) is just the number of individuals, genetics (b) is about genes, migration (d) is movement.

Answer:

1. c. All the populations of living organisms in an area and the non - living aspects of the environment.
2. c. Deer, mushroom, tree
3. b. Population
4. a. Equilibrium
5. c. Population density