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What are living things made up of

Five characteristics of living organisms + childrenThe characteristics of living organismsLiving organisms contain cellsLiving things obtain and use energyLiving organisms undergo growth and developmentLiving things make their offspringsLiving things respond to stimuli




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WHat are living things made up of



Living things reproduce

Reproduction is the process by which new organisms (offsprings) are generated. A living organism does not need reproduction to survive, but as a species, they need that for continuity and to ensure that they are not extinct.

There are two main types of reproduction: these include sexual reproduction and asexual reproduction.

What is a unicellular organism
Sexual Reproduction:
This involves two individuals of the same species, usually a male and female. Here the male and female sex cells come together for fertilization to take place. After this the newly fertilized cell goes on to become a new organism, the offspring. Note that not all sexual reproduction involve mating. (See the lesson on reproduction here)

What is a unicellular organism
Asexual reproduction: (Click for Asexual Reproduction)
This form of reproduction occurs without the involvement of another. Asexual reproduction is very common in single cell organisms and in many plants. There are many forms of asexual reproduction. Mitosis, fission, budding, fragmentation, sporulation and vegetative reproduction are all examples of asexual reproduction. In unicellular organisms, the parent cell just divides to produce two daughter cells. The term for kind of cell division is
Mitosis

Below is an illustration of the process of mitosis:
cell division

Living organisms do not live forever. Some live for many years, others live for a few years and some live for a few days. The term for the length of time an organism lives is called their ‘Lifespan’.
For instance, an adult mayfly lives for only one day, a mouse lives for 1-2 years and tortoise can live for about 152 yearssource1

But can you imagine what will happen to a species if it had no new ones (offspring) to replace them? They will be extinct. This means reproduction is essential for the survival of all species. It also ensures that the characteristics of the parents are passed on to future generations, ensuring continuity.

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What are the features of living things




Source 1: Biology, New Edition. by Milner and Levine. ISBN: 0-13-099672-6


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