16. Which of the following statements is/are correct?
A. The endoskeleton made of Chitin and protein in arthropods serves as a waterproof barrier and support for walking on land.
B. Given the following on the organism:
I. An animal
II. Multicellular
III. has tissues
IV. Has a circulatory system
V. has a hard exoskeleton and jointed appendages
This organism could be a member of the Phylum Insecta
C. Arthropods have a closed circulatory system
D. Arthropods can be found in all habitats of Earth
E. Insects are arthropods

Options A, B, D and E

Explanation:

Chitin and proteins which are major constituents of the exoskeleton of arthropods can act as waterproof barrier and also as a support for an arthropod. Organisms in the phylum Insects are animals, at multicellular, have tissues e.g. straighten muscle tissues adapter for movement. They also possess an open circulatory system, have a hard exoskeleton and joints appendages for movement. Arthropods have open circulatory system where blood rather hand been passed only in veins and arteries bathes all organs within the body. They are found everywhere and are arthropods.

Option A,B, D and E.

Explanation:

Phylum arthropods are the largest phylum of invertebrates in the animal kingdom. They have jointed appendages and open circulatory system.

They have exoskeleton I.e their body lack internal structures for supports. They have segmented bodies and they ate bilaterally symmetrical. Arthropods are found in every habitats. Chitin is the major constituent of arthropods endoskeleton and protein which serve as waterproof barrier while walking on land.

Examples of arthropods are insects, centipedes, millipedes, spiders, lobsters, mites, crabs e.t.c