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.
Answer:
The swim bladder is located in the body cavity and is derived from an outpocketing of the digestive tube. It contains gas (usually oxygen) and functions as a hydrostatic, or ballast, organ, enabling the fish to maintain its depth without floating upward or sinking.
Explanation:
Answer:
American Kennel Club = 202 dog breeds
Kennel Club = 211 dog breeds
Federation Cynolgique Internatioinale = 344 breeds
Answer: B, the number of species in a community
Explanation:
1-metaphase, since an ecuatorial plate is formed
2.prophase since the nuclear envelope is starting to dissapear
3.Telophase since new nucleae started to form around each separated genetic material
4.Interphase
5.Interphase
6.Interphase
7.anaphase since genetic material(chromsomes) is pulled to the poles of the cell
8.Interphase
9.Anaphase
10.Interphase
11.metaphase
12.telophase
13.Interphase
14.Prophase
15.interphase
16.interphase
17.metaphase
18.interphase
