Please help me with my Biology

Question

1.) the appendatges arthropods use to sense envoirnmental changes and to communicate with each other are called: A.manibles B. antennae C. spinnerets

2.) Some wasp reproduce asexually by: A. parthenogenesis B. metamorphosis C. cephalothorax

3.) Scorpions and spiders belong to the class: A. Arachnida B. Crustacea C. Insecta

4.) Which of the following is not a characteristic of echinoderms? A. an endoskeleton B. a thin epidemis C. a segmented body

*THANX TO ALL WHO ANSWER*

Answer 1

1. B Attenae are segmented appendages attached to the head above the mouthparts, with important sensory functions, including touch, smell, and in some cases hearing.

2. A Parthenogenesis an asexual form of reproduction found in females where growth and development of embryos or seeds occurs without fertilization by males.

3. A Arachnids are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. The term arachnid is from the Greek word άράχνη or arachne, meaning spider,[1] and also referring to the mythological figure Arachne.

4. C All echinoderms have spiny skin that helps protect the animals from predators. All are marine creatures, and all the larvae have bilateral symmetry. A ring of nerve tissue surrounds the mouth, and nerves branch off from this tissue to extend throughout the body.

Members of the phylum include sea stars, brittle stars, sea urchins, and sea cucumbers. The animals have the ability to reproduce by regeneration, a process in which a relatively small piece of the animal can regenerate an entire body. All echinoderms have an internal support system called an endoskeleton and a large body cavity containing a set of canals called a water vascular system.