Eight of nine phylum of animal kingdom are made up of
A. vertebrates
b.chordates
c. invertebrates
d. jointed-leg animals
111. Vertebrate Animal Phylum
____(A) Phylum Chordata
________1. Class Aves
________2. Class Fish
________3. Class Reptilia
________4. Class Mammalia
________5. Class Amphibia
IV. Invertebrate Animals Phylum
____(A) Phylum Porifera
____(B) Phylum Cnidaria
____(C) Phylum Platyhelmintes
____(D) Phylum Nematoda
____(E) Phylum Annelida
____(F) Phylum Mollusca
____(G) Phylum Arthropoda
____(H) Phylum Echinodermata
count them; 8 of 9 are invertebrates
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To determine which of the options A, B, C, or D is correct, we need to understand the definitions of the terms mentioned in the question.
Phylum: In the classification of organisms, a phylum is a major taxonomic rank below the kingdom and above the class. It represents a group of organisms that share a set of common characteristics.
Vertebrates: Vertebrates are animals that have a backbone or vertebral column. This includes animals like mammals, birds, reptiles, amphibians, and fish.
Chordates: Chordates are animals that possess a notochord, a hollow dorsal nerve cord, pharyngeal slits, and a post- tail at some point during their life cycle. This includes animals like vertebrates and a few invertebrates.
Invertebrates: Invertebrates are animals that do not have a backbone or vertebral column. This includes animals like insects, arachnids, mollusks, annelids, echinoderms, and many others.
Jointed-leg animals: Jointed-leg animals are organisms that have segmented bodies and appendages with joints, such as insects, arachnids, crustaceans, and some other groups.
Now, let's analyze the options:
Option A: Vertebrates - We know that vertebrates are a specific type of animals, but not all phyla in the animal kingdom are composed of vertebrates. So, option A is incorrect.
Option B: Chordates - Chordates include both vertebrates and some invertebrate groups. Therefore, this option is broader than vertebrates, making it possible that the majority of phyla are composed of chordates. So, option B is a potential answer.
Option C: Invertebrates - Invertebrates represent the vast majority of animals and are categorized into numerous phyla. This option seems like a strong possibility, considering that most animal phyla are made up of invertebrates. So, option C is a potential answer.
Option D: Jointed-leg animals - While jointed-leg animals are a well-defined group, they do not represent the major classification within the animal kingdom. Many phyla do not have jointed legs, so this option is unlikely to be the correct answer.
To recap, based on the information provided, options B (chordates) and C (invertebrates) are the most likely correct answers. However, we cannot definitively determine the correct option without additional information.