Answer:
Echo
Explanation:
Radars and Echoes work the same. Sound waves and sound reflection is used for echolocation for animals such as bats and dolphins. Radars are used to locate aircraft, ships, and other objects by using electromagnetic waves that bounce off of the object and back to the radar.
Heat — its the amount of heat energy required to raise a kilogram of water by 1 degree Celsius.
Answer:
faced a struggle for survival
Explanation:
The woolly mammoths became extinct, unlike the other species, because the woolly mammoths faced a struggle for survival due to changing of environmental conditions. Global warming is the main cause of extinction of woolly mammoth which destroy their habitats about 10,500 years ago. The environmental conditions are not favourable for them so they faced struggle for survival which causes extinction of woolly mammoth.
Answer: population density
Explanation: