In Terms of Annual Average Extent, Northern Hemisphere Sea Ice

question 6

Multiple Choice

In terms of annual average extent, Northern Hemisphere sea ice has ________since 1975.

• A) halved
• B) disappeared
• C) decreased by 8%
• D) doubled
• E) increased by 8%

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Definitions:

Genotype

A person’s genetic heritage; the actual genetic material present in each cell.

Recessive Trait

A genetic characteristic that is expressed in an organism only when two copies of the gene responsible for the trait are present.

Mitosis

Cellular reproduction in which the cell’s nucleus duplicates itself with two new cells being formed, each containing the same DNA as the parent cell, arranged in the same 23 pairs of chromosomes.

Meiosis

A specialized form of cell division that forms eggs and sperm (also known as gametes).