Question

1. select three reasons why an ecosystem could experience biodiversity loss.

a. seasonal change from winter into spring
b. land development for increased agriculture
c. population cycling among predators and their prey
d. increased commercial fishing to meet population needs
e. fragmentation of viable habitat during urban expansion

1. biologists are studying an area in virginia that once experienced a local extinction of the elk population due to overhunting and loss of habitat. in response to the local extinction, 75 elks from another state were relocated to virginia. after several years, the population had more than tripled in size. now, the biologists propose introducing a small population of elk from a different location into the area. how will this introduction most likely affect the local elk population?

a. gene flow in the population will cause significant loss of genetic diversity.
b. genetic diversity will increase in the population and reduce the chance of local extinction.
c. genetic diversity will not change since elk from the same species are all genetically identical.
d. interbreeding will introduce harmful genes into the population and cause a decrease in genetic diversity.

1. one of the most significant distinctions between different life - forms on earth is the difference between eukaryotic and prokaryotic cells. which feature shown in the diagram indicates that the cell is eukaryotic?

a. dna
b. nucleus
c. cell wall
d. cytoplasm

Explanation:

1. For the question about ecosystem biodiversity loss:

• Seasonal change from winter to spring is a natural - occurring, non - destructive process and usually does not cause biodiversity loss.
• Land development for increased agriculture can destroy habitats, leading to biodiversity loss.
• Population cycling among predators and prey is a natural ecological process and does not typically lead to long - term biodiversity loss.
• Increased commercial fishing to meet population needs can over - exploit fish species, causing biodiversity loss in aquatic ecosystems.
• Fragmentation of viable habitat during urban expansion can isolate populations and reduce biodiversity.

1. For the question about elk population:

• When a small population of elk from a different location is introduced, gene flow occurs. Gene flow can increase genetic diversity in the local population and reduce the chance of local extinction due to inbreeding or low genetic variation.

1. For the question about eukaryotic cells:

• Prokaryotic cells also have DNA, a cell wall (in some cases), and cytoplasm. The presence of a nucleus is a key feature that distinguishes eukaryotic cells from prokaryotic cells.

Answer:

1. b. Land development for increased agriculture, d. Increased commercial fishing to meet population needs, e. Fragmentation of viable habitat during urban expansion
2. b. Genetic diversity will increase in the population and reduce the chance of local extinction
3. b. Nucleus