We live in a world full of fluids, but not all fluids are liquids. Fluids are substances that flow, so gases are fluids, too. The atmosphere that surrounds Earth is a fluid that is crucial to all life forms on the planet. Unfortunately, we harm the atmosphere when we release dangerous gases into the air from cars, factories, and landfill sites. In this course you will get questions from the textbook, students in grade 8 will try to solve them.
Course Category: Science
In Chapter 4, you learned about the characteristics of living things. Living things are often called organisms. Organisms are living systems composed of smaller parts working together to carry out the processes of life. Despite its small size, a cell is an organism whose organelles work together to keep the cell alive. An organism that is made up of only one cell is called a unicellular organism (Figure 1). Almost all unicellular organisms are so small that they can only be seen using a microscope.