Answer:
This is antibiotic resistance. It occurs with over use of antibiotics.
When antibiotics are over used, likely targeted bacteria are being killed constantly even in absence of an infection. However, few bacteria may resist the antibiotics effects(selective pressure) , and therefore survived. If these resistant bacteria who were able to survive the selective pressure reproduce, they pass the resistant trait/ gene into their offspring.
Therefore with continuous exposure to antibiotics, they will resist the antibiotics effects(selective pressure),and thus reducing the effectiveness of antibiotic treatments with subsequent application.
Explanation:
Sickle-cell disease is common in tropical and sub-tropical regions because being a carrier, carrying a single sickle-cell mutation (sickle cell trait), affords some resistance to malaria.
B because your blood goes to organs and give the body nutrients.
8) is b.
im not sure if this is right though
18) is d
Answer:
4.4 Animal tissues (ESG6H) Animal cells with the same structure and function are grouped together to form tissues. There are four types of animal tissues: epithelial tissue, connective tissue, muscle tissue and nervous tissue.
Explanation:
