Changes in ecosystem habitats often take place naturally but sometimes are human-induced. which of the answers is true? a) land use areas would be reduced.? b) invasive species would die off due to uncertain climatic conditions. c) the numbers of human disease events would be reduced. d) organisms that can not adapt to the climatic changes will become extinct. e) seasonal weather patterns become less noticeable.

The true answer would be: D.  Organisms that can not adapt to the climatic changes will become extinct
For example, it is predicted that Koala soon will became extinct if the world temperature keep rising under current rate. This happen because they depended on Eucalyptus for survival and it does not grow well under high temperature.

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.