Question 4 of 25 Which of the following is an example of an unsustainable method of resource
management?
A. A construction company uses only nonrenewable building
materials
B. A community recreation area uses native plants that require
minimal irrigation.
C. A factory uses scrubbers to reduce pollutants emitted from
smokestacks
D. A neighborhood recycles products made out of glass or metal.

A. A construction company uses only non-renewable building materials.

An autotrophic protist - they can perform photosynthesis and mainly consist of unicellular algae. they can be divided into number of systematic group according to the shape of their cell and the type of photosynthetic pigments they use.

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.