Aboxer has been jumping rope for an hour. his leg muscles are burning and he feels weak. which substance is most likely causing the burning he feels in his muscles?

Which excerpt from the land, part 4 best supports the claim that paul is a talented horseback rider? a/“figure that says more than anything else! now, i want to ride that stallion! " b/my daddy shook his head. "paul only rides horses he knows. ” c/? i glanced over at the other rider. the fellow was older than i, and had the weight of a man on him. d/a man out of alabama, man name of ray sutcliffe, told my daddy i was such a good rider, he wanted me to ride some races for him.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur