C. The ecosystem but have limited resources.
Limited resources=intra and inter specific competition= the fittest survive and pass on their successful genes
Its true as you breath your heart and lungs go in and out as if you were swinging a door open and shut letting oxgen in and out hope i could help :)
As it gets colder, the molecules get less dense which causes it to get smaller.
B.cell wall
Cellulose is an important structural component of the primary cell wall of green plants.
Answer:
Cats also purr when they are nervous or in pain, leading some experts to believe that this uniquely feline vocalization is actually a method of self-healing. A domestic cat's purr has a frequency of between 25 and 150 Hertz, which happens to be the frequency at which muscles and bones best grow and repair themselves.
Explanation:
