1.Which of the following is a biotic factor within the ecosystem * • The climate in the area
• The herbivore that feed on producers
• Amount of oxygen
• Amount of sunlight
2. Which of the following contains only biotic factors? *
• Temperature, pH and rainfall
• Algae, shrimp and humidity
• Frog, climate and insect
• Ant, grass and snail

1. “The herbivore that feed on producers” because a biotic factor is a living thing. The other options are non-living things.
2. “Ant, grass, and snail” because like I said previously biotic factors are living things.
I hope this helps you.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.