1. When is it summer in the Northern Hemisphere?

when neither pole is receiving the most direct sunlight

during an equinox

when the Northern Hemisphere is closest to the sun

when the Northern Hemisphere is tilted toward the sun

What two processes sustain the earth's tremendous biodiversity?

Define exchange reaction

You have an f2 generation derived from two true-breeding parents with different characteristics for the same trait (determined by a single allele).

What is the relationship between photosynthesis and cellular respiration?

Starfish are able to reproduce both sexually and asexually. In an area of the ocean that is gradually changing due to increasing temperatures, it is more advantageous for starfish to reproduce because they will be able to.

1. Two years after the above frequencies were calculated, a biologist reexamined the cat population and counted 153 short-haired homozygotes, 568 shorthaired heterozygotes, and 397 long-haired cats. What are the frequencies of each allele now?

Select the correct answer from each drop-down menu. This map shows the level of water stress in different regions of United States. Region is most prone to water scarcity caused by rises in population.

The rising of regions of Earths crust to higher elevations is called ...

Explain what happens to energy as it moves through the energy pyramid.

What symptom of schizophrenia is illustrated by the following example? So bees with knees have fleas and fleas jump, I jump like a jack, Jack the Giant Killer.