Answer:
Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. These structures may or may not have the same function in the descendants.
My answer uh might not be the one you're looking for or isn't correct ✌
Explanation:
CO2 traps heat in the atmosphere of the earth which leads to global warming because of the green house effect
The telescope I feel like is one of the most important one
Other reasons are
Not finishing the antibiotics.
Or
Taking antibiotics too often
