What are the 9 properties of life?

All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, adaptation, growth and development, regulation, homeostasis, energy processing, and evolution. When viewed together, these nine characteristics serve to define life.

chem.libretexts.org - 1.1.1: Properties of life - Chemistry LibreTexts

What is the rarest element found in nature?

element astatine A team of researchers using the ISOLDE nuclear-physics facility at CERN has measured for the first time the so-called electron...

Last updated Jan 9, 2019

What do homeless people need most in winter?

Donate warm clothes, socks, and blankets. Don't let those coats and hats go to the trash. Shelters and individuals will be grateful for your gently...

Last updated Jul 6, 2020

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Levels of Organization of Living Things

Living things are highly organized and structured, following a hierarchy that can be examined on a scale from small to large. The atom is the smallest and most fundamental unit of matter. It consists of a nucleus surrounded by electrons. Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. Many molecules that are biologically important are macromolecules, large molecules that are typically formed by polymerization (a polymer is a large molecule that is made by combining smaller units called monomers, which are simpler than macromolecules). An example of a macromolecule is deoxyribonucleic acid (DNA) (Figure (PageIndex{6})), which contains the instructions for the structure and functioning of all living organisms. Link to Learning Video: Watch this video that animates the three-dimensional structure of the DNA molecule shown in Figure (PageIndex{6}). Figure (PageIndex{6}): All molecules, including this DNA molecule, are composed of atoms. (credit: “brian0918”/Wikimedia Commons) Some cells contain aggregates of macromolecules surrounded by membranes; these are called organelles. Organelles are small structures that exist within cells. Examples of organelles include mitochondria and chloroplasts, which carry out indispensable functions: mitochondria produce energy to power the cell, while chloroplasts enable green plants to utilize the energy in sunlight to make sugars. All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms. (This requirement is why viruses are not considered living: they are not made of cells. To make new viruses, they have to invade and hijack the reproductive mechanism of a living cell; only then can they obtain the materials they need to reproduce.) Some organisms consist of a single cell and others are multicellular. Cells are classified as prokaryotic or eukaryotic. Prokaryotes are single-celled or colonial organisms that do not have membrane-bound nuclei; in contrast, the cells of eukaryotes do have membrane-bound organelles and a membrane-bound nucleus. In larger organisms, cells combine to make tissues, which are groups of similar cells carrying out similar or related functions. Organs are collections of tissues grouped together performing a common function. Organs are present not only in animals but also in plants. An organ system is a higher level of organization that consists of functionally related organs. Mammals have many organ systems. For instance, the circulatory system transports blood through the body and to and from the lungs; it includes organs such as the heart and blood vessels. Organisms are individual living entities. For example, each tree in a forest is an organism. Single-celled prokaryotes and single-celled eukaryotes are also considered organisms and are typically referred to as microorganisms.

What is survival mode mentality?

What is survival mode? Stressful stimuli cause a physiological and psychological response called our survival mode. This mode involves the release...

Last updated Sep 17, 2018

Can you drink 20 year old water?

You should avoid drinking water left open for a very long time. The water left overnight or for a long period of time in an open glass or container...

Last updated Sep 28, 2022

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All the individuals of a species living within a specific area are collectively called a population. For example, a forest may include many pine trees. All of these pine trees represent the population of pine trees in this forest. Different populations may live in the same specific area. For example, the forest with the pine trees includes populations of flowering plants and also insects and microbial populations. A community is the sum of populations inhabiting a particular area. For instance, all of the trees, flowers, insects, and other populations in a forest form the forest’s community. The forest itself is an ecosystem. An ecosystem consists of all the living things in a particular area together with the abiotic, non-living parts of that environment such as nitrogen in the soil or rain water. At the highest level of organization (Figure (PageIndex{7})), the biosphere is the collection of all ecosystems, and it represents the zones of life on earth. It includes land, water, and even the atmosphere to a certain extent.

chem.libretexts.org - 1.1.1: Properties of life - Chemistry LibreTexts

What are some safety needs?

Safety needs – Examples include protection from elements, security, order, law and stability. Love and belongingness needs – These are the first of...

Last updated Oct 17, 2021