4. what structures to crayfish have that allow them to be successful in their environment?
5. what structures do other animals have that allow them to be successful in their environment?

Crayfish also known as craw fish are the freshwater crustaceans. If we talk about their structure, crayfish have an adjustable eyes that can moves around in all directions, thus helping them to sense danger. Apart from this, they have antennae which helps them to discover the movements in the water.

Similarly, every living creature on this planet have varied forms of structures which allow them to be successful in their environment. Those structure could be anything- it could be either their powerful sense of smell or their sharp long teeth, it could be their powerful body or anything.

its the first one

explanation:

think about it the answer is in the first paragraph

the price of our current war is high; it costs money and it costs lives.

but it does not cost our pride. it does not cost the guilt that would arise from knowing that we did nothing to intervene while our neighboring nations fell to despotic leaders.

it does not cost the terror of knowing that our allies are unstable. it does not cost the fear that we, too, will be next to fall.

which sentence most accurately explains why the speaker's use of the parallel structure is effective in this passage?

a. it underscores that disagreement will not be tolerated and will be dealt with swiftly.

b. it makes the speaker seem like a decisive and capable leader.

c. it emphasizes reasons to fight and inspires listeners to aid the war effort.

d. it establishes the speaker's credibility by acknowledging the difficulties of war.