Think about how Mary Oliver describes the turtle’s journey to lay her eggs on the beach. Based on her word choice and ideas, which statement best describes the theme of the poem? The natural world is a harsh place where all animals must fight to survive.
The natural world is connected in meaningful and beautiful ways.
The natural world is a confusing and dangerous place.
The natural world is a mysterious and dark world that no human can hope to understand.

science.

modern problems require modern solutions.

what do you mean.

do we have to write a essay?

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.