Double helix is the correct answer
C.Natural Selection would be the answer
Answer:
The answers are matched as follows:
African forests have been hunted to near extinction levels to obtain ivory-------------->human exploitation
The eruption of mount Saint Helens destroyed some populations of conifers------> natural disasters
An infection with a fungus reduced the population of North American Elm trees ----> disease
Increasing global temperatures have altered migration patterns of humpback whales ------>climate change
1. Polar Easterlies in the Northern Hemisphere blow from east to west.
2. Westerlies in the Northern Hemisphere blow from west to east.
3. Trade Winds in the Northern Hemisphere blow from east to west.
4. Polar Easterlies in the Southern Hemisphere blow from east to west.
5. Westerlies in the Southern Hemisphere blow from west to east.
6. Trade Winds in the Southern Hemisphere blow from east to west.
Answer:
Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when organisms from one trophic level are consumed by organisms of the next level. More specifically, 90% of metabolic energy is used, so only 10% will be passed down to the next level.
