
Concept explainers
Animals obtain energy by ______; they generally reproduce __ and their cells lack _______.

To review:
The given blank space in the statement, “animals obtain energy by__________; they generally reproduce____________, and their cells lack __________.”
Introduction:
Animals, unlike plants, cannot make its own food from the inorganic molecule. It is difficult to give the definition of animal and no definite character can define animal, so a list of character together defines an animal. These characters are not exclusive to an animal but together they distinguish other taxonomic groups from animal.
Explanation of Solution
Animals consume other organisms to get energy. Plants are the producers. They make food from sunlight. Herbivores like deer, eat them and then carnivorous animals eats herbivorous animals.
Reproduction is one of the key features of life. All organisms exist due to reproduction. There are mainly two kinds of reproduction, namely asexual and sexual. In asexual reproduction, an organism reproduces without the involvement of another organism and makes the same genetically similar or identical copy of it.
Normally, single-celled organism reproduces this way. Animals reproduce sexually. In sexual reproduction, two organisms are involved. Gametes (sperm and egg) from these organisms fuse together (fertilization) and after a series of cell division, a new organism is produced.
The cell wall is permeable, tough, flexible and made up of polysaccharides cellulose, hemicelluloses, and pectin. The cell wall is not present in the animal cells and it can be seen in plants, bacteria, fungi, and algae.
Animals obtain energy by consuming another organism; they generally reproduce sexually, and their cells lack cell walls.
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Chapter 23 Solutions
Biology: Life on Earth
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