Answer:
it contributes to development and evolution
Explanation:
The boys have done something and are in trouble, but because they are angry at one another they probably fought.
Answer:
A present participle is the -ing form of a verb, so your answer is "working."
Reduced the deaths of soldiers during wars and became the basis for future research.
1 .verbal B .a verb form used as another part of speech
2 .restrictive clause L .an adjective clause that is essential to the meaning of the sentence
3 .prepositional phrase F .phrase beginning with a preposition
4 .infinitive E .verb form preceded by to that is used as a noun, an adjective, or an adverb
5 .adverb phrase J .prepositional phrase modifying a verb, adjective, or adverb
6 .gerund phrase M .a verbal form ending in -ing with its object and modifiers used as a noun
7 .participle A .a verb form (which may end in -ing ) used as an adjective
8 .adjective phrase G .prepositional phrase modifying a noun or pronoun
9 .phrase D .group of words without a subject and verb used as single part of speech
10 .participial phrase H .participle with complements and modifiers
11 .coordinating conjunction K .a conjunction that joins words or groups of words of equal rank
12 .verb phrase I .verb ending in -ing used with a helping verb
13 .gerund C.a verb form ending in -ing used as a noun
