Answer:
Sometimes molecules cannot move through the cell membrane on their own. These molecules need special transport proteins to help them move across the membrane. Facilitated diffusion is the diffusion of substances with the help of transport proteins in the plasma membrane. These special proteins are called channel proteins or carrier proteins, and they are attached to the cell membrane. In fact, they go through the cell membrane, from the inside of the cell to the outside. Facilitated diffusion is used for molecules that cannot diffuse rapidly through cell membranes on their own, even when the molecules are moving from high to low concentration areas. An example is the sugar plants and animals use for energy, called glucose. Even though facilitated diffusion involves transport proteins, it is still passive transport because the solute is moving down the concentration gradient so it does not require the use of cellular energy.
Explanation:
mice can bite the elephant's trunk and/or feet and they can get the elephants a surprise.
The Answer Would Be
B. <span>the similarities in the body systems such as the nervous and circulatory systems
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The evidence would be all the different types of species
d. dynamic and changing
Explanation:
The marketing environment is best described as being dynamic and changing.
Marketing is a set of activities whereby a company promotes their products and services.
- A marketing environment refers to all factors that ensures the producers serves their customers better.
- There is no real static model to make predictions about the marketing environment.
- Since it is targeted and centered on customers, the marketing environment is constantly changing and dynamic.
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