Answer:
Isn't there any photo or some options at least? Actually, it says which of the following-that's why I asked
Explanation:
If you add something as a reference then I will be able to answer and help you :)
Answer:
Charles Darwin and Alfred Russel wallace in the 19th century
so the answer is d
Answer:
There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest. Fluid friction occurs in fluids, which are liquids or gases.
