Answer:the resistance that one surface or object encounters when moving over another.
Explanation:it is easy!
Answer:
1st is correct
Explanation:
At its simplest, a dog's digestive system is a long tunnel that runs from their mouth to the anus. Food goes in at the mouth and travels through this tube and at various stages is broken down and either absorbed into the body or excreted as waste at the anus.
They are composed of actin, troponin, tropomyosin, and myosin
