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Characteristics of Living Things

Cells

Sense and Respond

Living Things Reproduce

Living Things Have DNA

Living Things Use Energy

Living Things Grow and Develop

Esteban Period 4

A cell is the smallest unit of life. It carries out activities of life and can't be seen with the naked eye. Cells are surrounded by a cell membranw, which seperates the cell from from the cell's enviroment. So different parts of the cell function differently. Some living things are made up fo trillions of cells, then different cells preform specilized functions.

All living things sense and respond to changes in the envirioment which is called stimulus or stimuli if it is plural. Stimuli causes organisms to respond in a different way. Conditions in an organism need to stay the same, even though the enviroment is changing around it. The body's inside staying the same is called homeostasis. When your body responds to external changes like sweating when it is hot or shivering when it is cold, your body is trying to return itself to normal. Organisms also need to stay normal, but they do not respond like the way humans do. When organisms are hot, they move to the shade and when they're cold, they move to the sunlight.

Living things reproduce by making offspring like themselves either sexually or asexually. In sexual reproduction, two parents make offspring that share characteristics of both parents. Most animals and plants reproduce sexually. In asexual reproduction, a single parent makes offspring that are the same to the parent. Most single-celled organisms reproduce asexually.

All cells of living things have deoxyribonucleic acid or DNA. DNA tells and carries what the organism's traits are. When reproducing, organisms pass copies of DNA to their offspring. Passing DNA makes sure that the traits of parents are passed to the offspring. This is called heredity.

Living things use energy because they carry out chemical activities of life. Some activites change into food. It breaks down the food and moves the material in and out of cells. It grows and builds the cells. An organism's metabolism is the sum of all the activites that it preforms.

All living things grow. In single-celled organisms, cells divide and get larger. This allows it to make other organisms. In multicellular organisms, the number of cells increase and makes it larger. As living things grow, they can grow and develop.

Click here for more information about cells

Click here for more information about DNA

Click here for more information about reproducing

Click here for a video about dna

Click here for a video about cells

Click here for a video about the 6 characteristics of living things

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