Those that do not show artificial selection are examples A and B.
Answer:
The sun / The UV lights that the sun emit
Explanation:
Answer:
Yes
Explanation:
This is to prevent the extinction of flora and fauna. If extinction occurs, the ecosystem will be disrupted.
(sorry x blajar dlm subjek bm tapi bole translatekan)
Protons . Electrons are negatively charged and neutrons have no charge .
Ans.
Different barriers present in the body prevent entry of disease causing agents or pathogens from entering into body and provide protection against them. These barriers include various physical, chemical, and biological barriers.
Physical barrier include skin and coughing and sneezing. Skin provides first line of defense by preventing entry of pathogens, and coughing and sneezing that expels harmful agents out of the body.
Chemical barriers include lysozyme, acids, and oil secretion. Lysozyme is an enzyme that kills bacteria by targeting their cell wall, while oil and acid prevent microbial growth by providing non-favorable environment for them.
Biological barriers include phagocytes and Langerhans cells. Phagocytes are immune cells that engulf and destroy pathogens and Langerhans cells are antigen-presenting cells that help in elimination of pathogens.