1. How many layers are there in an arthropod's exoskeleton? What is the main function of each layer?

Study this image. which statements best describe the rock shown? check all that apply. the grains of this rock are jagged. this rock has several coarse grains. the grains in this rock are very large. this rock has a non-banded pattern. the color of this rock is determined by its texture.

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

Name the glands associated with human digestive system