B. The first electron shell hold 8 electrons.
Answer:
D. When animals move into an ecosystem
Explanation:
Immigration by definition is moving to a new place
Answer:
This symptom is seen in case of Cirrhosis disease.
Explanation:
Cirrhosis is also called as liver cirrhosis, a condition where liver dysfunction takes place due to excessive intake of alcohol.This is a long time process and the scar tissue takes the place of normal tissue present in the liver.
The susual symptoms include tiredness,weakness,itchy, swelling of legs, yellow skin, fluid buildup in the abdomen.
Other impotrtant factors that causes this disease are hepatitis B,hepatitis C, non alcoholic fatty acid liver disease etc.
This disease can be prevented by applying proper vaccine,antviral medications, steroid medication, ursodiol,liver transplant etc.
Answer:
Cell membrane or plasma membrane is the semi-permeable outer layer surrounding the components of the cell.
It is important to the cell as it provides important properties to the cell as it separates the aqueous interior of the cell from the external environment, helps in cell–cell contact, in surface recognition, signaling and transport.
The plasma membrane is made up of different types of molecules like phospholipids, proteins, cholesterol, carbohydrates providing flexibility to the layer so, the model of membrane is known as fluid mosaic model.
The primary constituent of membrane is a lipid molecule called Phospholipids which is made up of glycerol molecules attached to a phosphate group and forms a hydrophilic head while long fatty acyl chains attached to the head froms hydrophobic tails.
It is the fatty acid chains which provide hydrophobic nature to the cell membrane. These layers are arranged in the form of bilayer with head towards outside while tails inside.
Along with phospholipid membrane posses peripheral and integral proteins which helps in transport of the molecules across membrane.
Answer:
Natural selection causes changes in populations because of the differential reproductive success of genetically varied individuals. That's the correct answer, for the selections that you have provided. Therefore, the correct answer in the selections you have provided would be letter B above; that's the true one!