Answer:
Problem-solution
Step-by-step explanation:
The Text structure is defined as the organizational pattern in which the author has arranged or presented the information to the readers. The author primarily organizes the written text in a specific structure to comprehend readers' understanding.
In the given excerpt from 'A Student's Guide to Global Climate Change', the author employs 'problem-solution' text structure as he first addresses the serious problem 'Climate change might allow some infectious diseases like malaria to spread' that needs to be addressed as it may lead to disastrous consequences and afterwords provide a possible solution to it('People should take common-sense steps to avoid tick and mosquito bites...patients'). The author primarily organizes the written text in a specific structure to comprehend readers' understanding.