Snails are considered living creatures because they grow, reproduce, respond to their environment, and have a complex structure. Their shells, although stationary, are part of their living, biological systems.
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A living creature is defined by its ability to grow, reproduce, respond to stimuli, and maintain homeostasis. These characteristics differentiate living organisms from non-living things, which do not exhibit these features.
Growth refers to an increase in size or mass, while development involves changes in complexity and function. Growth is quantitative, whereas development is qualitative, encompassing the maturation of structures and abilities.
Genetic material, such as DNA, provides the instructions for developing and functioning of organisms. During reproduction, genetic material is passed to offspring, ensuring that traits and characteristics are inherited and maintained across generations.
Reproduction can be sexual or asexual. Sexual reproduction involves the fusion of gametes from two parents, while asexual reproduction involves a single organism producing offspring without gamete fusion, such as through budding or fission.