Nylon fiber is classified under which one of these headings?
a. protein
b. polyurethane
c. polyester
d. polyamide

Convert 0.14 kilograms to grams.grams

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Each hereditary trait corresponds to