Tutor profile: Fanny Z.
Explain the difference between 吗，妈，and 马.
吗 is added at the end of a sentence to signal that the sentence was a question, 妈 means "mom, and 马 means horse.
Subject: Environmental Science
What is the difference between K species and R species?
The population of R species is larger than the population of K species. Furthermore, R species live in unpredictable environments while K species live in stable environments.
Subject: Basic Math
There are 40 apples and a dog eats 10 apples. How many apples are left?
40-10 = 30! the answer is 30 apples