An _____ is an ocean invertebrate having spiny skin.
Echinoderm
Coelenterate
Arthropod
Exoskeleton
Invertebrate
Echinoderm.
_____ is an invertebrate animal with jointed legs and an exoskeleton.
Exoskeleton
Coelenterate
Arthropod
Echinoderm
Invertebrate
Arthropod.
The correct answer is "Echinoderm."
To determine the answer, you can break down the options and compare them to the given description.
1. Echinoderm: Echinoderms are ocean invertebrates with spiny skin. They include animals like starfish, sea urchins, and sea cucumbers. This option matches the provided description.
2. Coelenterate: Coelenterates, also known as Cnidarians, include animals like jellyfish and corals. They do not have spiny skin, so this option does not match the given description.
3. Arthropod: Arthropods are a large group of invertebrates that include insects, spiders, and crustaceans. Although some arthropods may have exoskeletons and spines, not all of them have spiny skin. Therefore, this option does not completely match the given description.
4. Exoskeleton: An exoskeleton is a hard outer covering found in some invertebrates, including arthropods. While some animals with exoskeletons might have spines, not all do. Thus, this option is not a specific enough match to the given description.
5. Invertebrate: An invertebrate is an animal without a backbone. While this option indicates the absence of a backbone, it does not provide any information about spiny skin. Therefore, it does not match the given description closely enough.
Comparing all the options, the only word that matches the description of an ocean invertebrate with spiny skin is "Echinoderm."