Question

berk says your mind, hormone system and immune system are constantly communicating with one another in ways that impact everything from your mood to your ability to fend off sickness and disease. take grief: \grief induces stress hormones, which suppress your immune function, which can lead to sickness,\ he says. -- \you asked: does laughing have real health benefits?\ markham heid which topic sentence best introduces the supporting evidence in this passage? laughter is the brains way of getting rid of stress caused by a weak immune system. grief can be very painful and is often hard for people to overcome, so they laugh often. the hormone system is very important and function only if people are happy. the systems in our bodies communicate with one another, which affects health and healing.

Explanation:

The passage first states that the mind, hormone system, and immune system communicate and impact health (including fending off sickness). Then it gives an example (grief inducing stress hormones that suppress immune function and can lead to sickness). The fourth option "The systems in our bodies communicate with one another, which affects health and healing" encompasses the main idea of the passage (body systems communication and health impact) and the example (grief - immune - health link) supports it.
The first option is incorrect as the passage doesn't say laughter is to get rid of stress from a weak immune system. The second option has a wrong cause - effect (grief doesn't cause people to laugh often as per the passage's example, the example shows grief's impact on immune system). The third option is too narrow (only about hormone system and happiness) and not in line with the passage's focus on multiple systems (mind, hormone, immune) communication.

Answer:

The systems in our bodies communicate with one another, which affects health and healing.