A, it is a self-defence mechanism, where they only do it if they have to.
Hope this helps!
Answer: Land: Denser materials sank to the earths center and less dense materials were forced to the outer layers, forming a thin crust. Atmosphere: Less dense molecules rose to the surface. Oceans: As earth cooled, water vapor condensed to form rain which lead to the formation of oceans.
Amino acids are the building blocks of proteins
Answer: number 1 is zygote
Just like humans, the dogs cells are designed, DNA caused, hereditary, ect. are programmed to break down at a certain time in life. hope this helps....
