Concept explainers
To determine:
The common characteristics of all the animals.
Introduction:
All animals are multicellular, which means that their bodies are made of many cells. They are eukaryotes, their cells have a nucleus and other membrane-bound organelles. All animals are heterotrophs as they ingest their food.
Explanation of Solution
The following are the common characteristics of all the animals:
Multicellularity:
All the animals are multicellular and are made of multiple cells. The number of cells varies from hundreds to trillions, for example, the roundworm, Caenorhabditis elegans is exactly made of 1,031 cells, whereas a human being is composed of trillions of cells.
Eukaryotes:
All animals are eukaryotes. Their cells have well-defined nuclei and membrane-bound organelles such as mitochondria. All the animals are eukaryotes, but all eukaryotes are not animals, for example,
Heterotrophs:
All animals are heterotrophs. A heterotroph is an organism that cannot synthesize its food, but depends on other organisms, such as plants and animals to sustain its life.
Mobility:
All animals are mobile at some stage in their life cycles. Although some animals such as sponges and corals are immobile in their adult stage, their larvae are mobile.
Ability to reproduce:
All the animals have the ability to reproduce and produce new offspring similar to them. Both sexual and asexual mode of reproduction is observed among the animals.
All animals are multicellular, eukaryotes, and heterotrophs. They have the ability to move and reproduce.
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