1. corrosion a. the process of building with metal
b. the process of deteriorating or wearing down (especially by
chemical action)
c. the process of melting (especially by applying heat)
2. ecosystem
a. the system that connects animals to each other
b. the system that connects plants and animals to their physical
environment
c. the system that connects the economy and the environment
3. precipitation
a. water in
any form (e. g., rain, snow, sleet) that falls on the earth
b. dry weather (e. g., the climate of the desert)
c. hot weather (e. g., the climate of regions located near the equator)
4. source*
(a. a place from which something originates
b. money
c. a flavorful liquid served over food
5. emission
a. something released and sent out (e. g., radiation, gas)
b. an automobile part
c. a poor driving habit
6. vulnerable
a. easily attacked or harmed

Find answers below.

Explanation:

1. Corrosion: the process of deteriorating or wearing down (especially by chemical action). It is a chemical process which causes rustiness in physical objects such as metals due to the formation of an oxide. Corrosion is commonly prevented by galvanization of metals.

2. Ecosystem: the system that connects plants and animals to their physical environment.

An ecosystem can be defined as the natural living habitats of both living and non-living organisms. Essential services such as plant pollination, water purification, nutrient cycling etc that are being provided by the ecosystem are really very vital, important and useful for the sustenance of life, both for humans and enhances social welfare.

3. Precipitation: water in any form (e.g., rain, snow, sleet) that falls on the earth. It is known as one of the elements of weather and it's essentially water that is being released from the sky.

4. Source: a place from which something originates. It can either be primary or secondary depending on the hierarchy.

5. Emission: something released and sent out (e.g., radiation, gas). It is usually associated with pollutants and radioactive elements that undergo nuclear reactions.

6. Vulnerable: easily attacked or harmed. It is the state in which a living organism can easily be infected, harmed or attached by another. Susceptibility s synonymous with vulnerability.

it's either a or b. i'm leaning more towards a.

d

explanation:

i remember this its d