Caleb is researching the possibility of colonizing Mars. He found two sources for his topic. Read the two passages Caleb found.
Source 1
Many people say Mars is cold and desolate, and there’s nothing to grow there. We can genetically modify plants and algae to thrive in the Martian atmosphere. But who’s going to do the heavy lifting? We all would like to see futuristic cities on Mars, but robots are going to become much more adapted to working in these harsh environments by the end of this century, so we expect to see robotic construction workers building the fantastic domed cities you see in science fiction novels.
–Michio Kaku,
Quoted in "There’s Only One Way for Humanity to Survive. Go to Mars,”
Simon Worrall
Source 2
"I think we could produce most of our things on Mars except perhaps the most sophisticated electronics and such,” says van Susante. "From a biological standpoint the picture is less clear since there may be trace elements and vitamins, that we would need to import.”
–Paul van Susante,
Quoted in "Could We Survive Without Our Planet?,”
Abigail Beall

devin will have to drain the rain out from his garage.

laughter and happiness are an essential part of life. laughing releases the body's "feel good" chemicals. thus, it provides long or short term relief from stress and or anxiety. more or less, laughing strengthens social connections and provides an easy approach in social related situations.

moreover, there are many benefits of laughter and humor. it's as if they play the role of superhero to combat anxiety and depression, according to researchers. happiness and laughter is the best medicine for teen mental health.

what happens in the body also affects the mind. the positive changes in physical health also have profound an impact on mental health. we have a lot to gain from laughing! medical effects of laughter have continued to validate the pain-relieving effect and benefits of laughter.

scientists tell us that laughter and humor actually, believe it or not, lower blood pressure, reduce stress hormones and increase muscle flexion. there are many benefits to happiness and laughter, and they so happen to increase the circulation of antibodies in the blood stream and make us resistant to infections.

as stated before, laughing releases your body's "feel good" chemicals, and on a related note, negative stress can cause your body to release chemicals that weaken your immune system which makes you more likely to contract a disease. luckily, laughter reduces negative stress and prevents those chemicals from being released.

all in all, you may want to consider laughing as much as you can!

c. would be the answer : )

explanation: