3. which sentence has an error in a plural noun?
o many things believed to be supernatural are actual natural phenomenons.
o do you have any baby teeth left?
not all bacteria are bad for your health; some can be beneficial.
o my friend judges the calves at the local 4h show every spring.

600 grams is the answer

i feel like it is actually b.

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

what part is in bold?