Do glaciers weight cause them to slide down mountains?

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

Why should organisms reproduce more offspring than will survive? select all that apply.