Plz help I need this done by Monday​

Which element provides strength to the exoskeleton of clams and oysters

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

Discuss the functions of epithelial connective nerviud and muscular tissues