26) the contractile units of skeletal muscles are
a) microtubules
b) mitochondria
c) t tubules
d) myofibrils

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Drag each tile to the correct location. match each trait that an organism displays to a reproductive strategy.

What factors contribute to the effect an environmental toxin has on the human body?