Which trait would best indicate that a particular arthropod was a member of subphylum chelicerata? jointed appendages sexual reproduction terrestrial lifestyle two body segments compound eyes?

The answer is two body segments.
The trait that would best indicate that a particular arthropod was a member of subphylum chelicerata is that it possess two body segments instead of three; a fused head and thorax (cephalothorax), and an abdomen (opisthosoma). Their segmented body with jointed limbs is covered in a cuticle made of chitin and proteins. The subphylum chelicerata includes the arachnids, horseshoe crabs, scorpions and related forms.

The two body segment is the trait which indicates that a particular arthropod was a member of subphylum chelicerata.

Further Explanation:

The subphylum Chelicerata belongs to the phylum Arthropoda which includes spiders, scorpions, ticks, mites, sea spiders, horesshoe crabs and harvestmen. The general characteristics of Arthropoda are segmented body, bilateral symmetry, jointed appendages, chitnous exoskeleton and compound eyes. The phylum Arthropoda is divided into five subphylum which includes Chelicerates, Trilobites, Myriapods, Crustaceans and Hexpods. Both terrestrial and marine animals belong to this phylum and type of reproduction differs based on the habitat which can be internal or external fertilization.

The general characteristics of the subphylum Chelicerates includes two body segments called as tagmenta, cephalothorax or prosoma with anterior six segments, abdomen or opisthosoma with thirteen segments but it has no antenna and mandibles. The chelicerae is the mouth part which is the modified anterior most appendages.

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Answer Details:

Grade: Senior School

Subject: Biology

Chapter: Classification of organisms

Keywords:

Chelicerata, Arthropoda, phylum, subphylum, tagmenta, prosoma, opisthosoma, trilobites, Myriapods, crustaceans, Hexapods, segmented body, bilateral symmetry, jointed appendages, chitinous exoskeleton.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]