Which explains how genetic variation occurs by way of sexual reproduction? 1)The union of sperm and egg occurs during meiosis.
2)Half of each chromosome pair comes from each parent
3)Sexual Reproduction does not produce variation
4)Meiosis occurs in all body cells also.

Most of earth’s fresh water is found in oceans and seas stored in glaciers and ice caps groundwater stored beneath the surface found in lakes, rivers, streams, and reservoirs

In general, how long does it take to accomplish a long-term goal? a. a few days to a weekb. a few weeks to a monthc. a few months to a yeard. more than a year

For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?