An arthropod is an invertebrate, belongs to the phylum Arthropoda, which is largest phylum of the Animal Kingdom. Arthropods have organ system level of body organization and are bilaterally symmetrical, metamerically segmented body, triploblastic with true coelom. They possess pair of lateral jointed appendages and their body is covered with exoskeleton made of chitin.
An arthropod does not have notochord and endoskeleton. These two are features of a vertebrate.
By definition, an arthropod is an animal that is invertebrate and has an exoskeleton also known as an external skeleton. In addition they have a jointed appendages. Other characteristics include segmented bodies, open circulatory systems and bilateral symmetry. Based on this we can say that from the list given we can select "endoskeleton" "jointed appendages"
Strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. This is a result of anaerobic respiration.
