Answer:
Mechanical barriers — which include the skin , mucous membranes , and fluids such as tears and urine — physically block pathogens from entering the body. Chemical barriers — such as enzymes in sweat , saliva , and semen — kill pathogens on body surfaces.
Answer:
D
Explanation:
Just trust me.
it's not A because there's no such thing as favorable traits whenever it comes to incesticide and for B the majority of Beatles and future generations will also die that's only to the ones that died but that can not happen, which means that D is the one that will be the correct answer because if one lives, then the rest of the generations live due to immunity in the generation that started it.
Electron shell is the outer orbital, while the inner orbital are just called orbitals.
Answer: Older age.
A personal or family history of cancer.
Using tobacco.
Obesity.
Alcohol.
Some types of viral infections, such as human papillomavirus (HPV)
Specific chemicals.
Exposure to radiation, including ultraviolet radiation from the sun.
Explanation:
Answer:
If you double the speed of an object, the kinetic energy increases by four times. The word "kinetic" comes from the Greek word "kinesis" which means motion. Kinetic energy can be passed from one object to another in the form of a collision.
Explanation:
The kinetic energy is proportional to the square of the speed, so doubling the speed increases the kinetic energy by a factor of 4.
