PLEASE HELP Arthropods are the largest phylum of animals. All arthropods have jointed legs and a segmented body, or a body of separate sections. Arthropods include arachnids, crustaceans and insects. Arachnids usually have eight legs and no wings or antennae. Spiders and scorpions are examples. Crustaceans are arthropods with hard exoskeletons outside their bodies. Lobsters and crabs are examples of crustaceans. Insects have exoskeletons, too. Insects are arthropods that usually have wings, six legs and a head, thorax and abdomen.

Koreana can’t tell if an organism is a crustacean or an insect. Which of these should she ask?

a. Does it have wings?

b. Does it have jointed legs?

c. Does it have a backbone?

d. Does it have an exoskeleton?

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl +4h2o enter the elemental symbol. view available hint(s) is reduced