Answer:
The best and most correct answer among the choices provided by your question is the fourth choice or letter D "The thin membrane that closes the cavity of the middle ear from the outside changes position."
Your ears pop in airplanes because the air high above the surface of Earth is less dense than air near the surface, because air near the surface has all the air above it pushing down. Your inner ear has air trapped in it and as the atmospheric pressure changes, it causes pressure on your eardrum.
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Explanation:
A fixation. precipitation is rain and snow condensation is what forms clouds and evaporation is when water from bodies of water go back to the sky<span />
Stomata are normally opened during the day because photosynthesis happens during the day. The stoma allow oxygen and carbon dioxide to diffuse through them.
Coal is expected to have the highest rate of consumption in 2030.
Answer:
The three parts of the cell theory are as follows
(1) All living things are made up of cells
(2) Cells are the smallest units (or most basic building blocks) of life
(3) All cells come from preexisting cells through the process of cell division.
Explanation:
(1) The first characteristic of a living thing is that they are made up of cells. A cell is the basic building block of all organisms. It is the smallest unit of organization in a living thing. They contain the organism's hereditary information (DNA) and can make copies of themselves in a process called mitosis.
(2) Cells make up the smallest level of a living organism such as yourself and other living things. The cellular level of an organism is where the metabolic processes occur that keep the organism alive. That is why the cell is called the fundamental unit of life.
(3) All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living organisms. The activity of an organism depends on the total activity of independent cells. Energy flow (metabolism and biochemistry) occurs within cells.