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What are the 3 themes of life?

Themes in Biology: Diversity, Interdependence & Evolution.

study.com - Themes in Biology: Diversity, Interdependence & Evolution

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Diversity: We Are Many

The study of (bio)diversity involves accounting for and classifying the many different types of living things on Earth. With the discovery of each distinct species, be it alive now or extinct, our awareness of the vast biodiversity of our planet increases. On the most general level, all life can be divided into three major domains: Bacteria : single-celled microscopic organisms found literally everywhere across the planet, including inside of your own body! : single-celled microscopic organisms found literally everywhere across the planet, including inside of your own body! Archaea : single-celled, microscopic organisms that are similar to bacteria and generally love extreme environments. : single-celled, microscopic organisms that are similar to bacteria and generally love extreme environments. Eukarya: more complex single-celled and multi-celled organisms, ranging from a single paramecium to fungi, plants, and animals. All living things are grouped into three major domains, from which they are further classified. From this basic classification system, each domain is further classified into kingdoms, then phylum, class, order, family, genus, and species.

A sample of different types of fungi, illustrating their vast biodiversity.

It is important to point out that living things do not always fit neatly into our method of classification. Earth's amazing diversity of life is far more complex than our way of labeling. But classifying biodiversity is a dynamic process itself, and allows us to best understand how each species relates to the others.

Interdependence: We Are Connected

All of this diverse life on Earth would not exist if not for the complex and dynamic interactions between organisms. This is where the concept of interdependence comes into play. Scientists in the field of ecology study the interactions between organisms, especially the ways in which they depend on each other. For example, we depend on oxygen to breathe. Oxygen is the byproduct of plants and algae undergoing photosynthesis. When we exhale carbon dioxide, these plants use it to make oxygen and basic sugars. Humans, as well as many other organisms, eat plants to get that energy. This is just one basic example of interdependence among living things. Other examples include:

Predator-prey relationships

Symbiosis , a co-dependent relationship between two species that can be positive or negative for one or both species. , a co-dependent relationship between two species that can be positive or negative for one or both species. Territoriality

Competition for resources.

Coral and anemones have a symbiotic relationship in which both benefit.

The delicate balance inherent in these relationships among organisms is at the crux of life on Earth. Understanding how they work, and how they change over time, is critical to our knowledge of biology.

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What body parts age the fastest?

You might be surprised to know that your face is not actually the part of your body that ages the fastest. It is, in fact, your breasts. A study, published by the journal Genome Biology has found that breast tissue is the part of the body that's most sensitive to the affects of ageing.

goodhousekeeping.com - This is the part of your body that ages the fastest - Good Housekeeping

When you think about your anti-ageing skincare routine and how to stop wrinkles, are you mainly thinking about your face?

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The breasts are exposed to a number of elements that can induce sagging and ageing. Firstly, changes in the size of the breasts due to weight loss, weight gain and pregnancy causes the skin and the tissue to stretch - this reduces its elasticity. Moisturising the chest skin daily (as you would your face) can help to slow this process. Another big offender is SPF exposure on the chest which causes the skin to age quickly and lose its firmness – low cut tops and bikinis leave your breasts exposed to harmful and ageing sun damage. To prevent this, we should apply sun cream whenever our chests are out – even when the sun is not - or wear tops with a higher neck. So, when you’re considering your anti-ageing skincare from now on, remember not to restrict it to just your face - add your chest and breast area into your routine too.

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