2. In order to grow, animals with an exoskeleton must a. Shed their skin
b. shed their shells
C. continue cell reproduction
d. find larger shells to inhabit.

a.shed their skin..

Explanation:

Exoskeleton

A true exoskeleton, like that found in arthropods, must be shed (moulted) when it is outgrown. ... The new exoskeleton is still capable of growing to some degree, however. Animals of the order arthropoda, like lizards, amphibians, and many other animals that shed their skin, are indeterminate growers

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.