Of the three muscles tissues, which one is made up of intercalated discs? Skeletal
O Cardiac
O Smooth
O All of the above

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

Which would be the most useful source of evidence to support mcneill's contention?

What is the problem in this article? what solution does the article propose?