Answer:
a sound wave moves through air by displacing air particles in a chain reaction, sound energy is associated with vibrations created by a vibrating source, that requires a medium to travel, which makes sound energy a mechanical wave
Explanation:
hoPE that helped :)
Answer:
The countries should take the following steps to reduce the carbondioxode emissions in the atmosphere.
1) Basically high amount of carbondioxode gas is emitted from vehicles. So if the government reduces the number of vehicles or use those vehicles that are environmental friendly like solar vehicles. So the concentration of carbondioxode will be reduced.
2) Grow such type of organisms which uses the carbondioxode. Such type of organisms are plants. Grow more plants, so the concentration of carbondioxode is reduced.
Answer:
Read below
Explanation:
Climate change is driving down populations of some Arctic tundra natives such as caribou (also known as reindeer) by fostering an increase in parasites and disease while damaging food sources. But other species, such as shrubs and the wolf spider, are thriving.
Because they don't have a or any cells and have no DNA
Answer:
no digestive system
Explanation:
Animals in Cestoda have no digestive system so they takes nutrients through its cell wall. Cestodes have no digestive tract so they absorb nutrients from the host across the body wall. Most of the flatworms have conspicuous digestive systems while on the other hand, the digestive system of turbellarians consists of mouth, pharynx, and intestine so we can conclude that Cestoda have no digestive system to absorb nutrients like other organisms.