Possible answers:
[+] an object;
[+] humans;
[+] animals;
[+] density;
[+] tortoises;
[+] barnacles;
[+] h2o;
[+] oysters;
Given those answer options, answer the question: Fact 1: Most mollusks have shells. Fact 2: Clams, oysters and snails are familiar mollusks. Given the two facts above, what usually has a shell?
A:
oysters