A vaccine works by training the immune system to recognize and combat pathogens, either viruses or bacteria. To do this, certain molecules from the pathogen must be introduced into the body to trigger an immune response.
Answer:
D. Over fifty chemicals in tobacco are known to cause cancer.
Explanation:
Eating disorders like anorexia and bulimia can affect both boys and girls.
Any form of tobacco is dangerous.
Alcohol is definitely responsible for more than 10% of fatal automobile accident.
This can be explained by analyzing the two chemical equations
The equation for photosynthesis is:
6CO2+6H20--->C6H12O6+6O2
The equation for aerobic respiration is:
C6H12O6+6O2--->6CO2+6H2O
The oxygen that is produced by the photosynthesis is consumed by the organism that do aerobic respiration.
Answer:
The correct option is B. The claim is invalid because there are many types of bacteria that help organisms maintain homeostasis.
Explanation:
Bacteria are often considered to be disease or infection-causing organisms but this is not true. Not all bacteria are harmful, many other bacteria's play essential roles in the maintenance of life on the Earth. The human body is made of many bacteria which help in maintaining the homeostasis of the body. The human body is surrounded by enormous bacteria that are good and they are termed as human's natural microbiota.
the third statement is wrong. Parenchymal cells have thin walls and the nuclei are not visible.
