All but one is an example of a invasive species. that is

a. zebra mussels introduced into the great lake region from russia that have affected the local species of mussels.

b. the brown tree snake that was introduced to guam from australia and has led to the devastation of the local bird population

c. tomato plants brought into a garden and given the opportunity to grow and thrive without any harm to any other plant species.

d. kudzu imported from china as a ornamental plant that has grown to cover native forests throughout the southeastern united states.

The answer is C. The tomato plants are not harming other plant species, therefore they're not 'invading'.

An ice age is the amount of the Earth's water that is locked up on land in the form of glaciers.
According to the scientists, an ice age occurs every 100,000 years. There are five major ice ages in the Earth's history. That are the Andean-Saharan, Huronian, Karoo Ice Age, Cryogenian, and the current Quaternary glaciation.
But, If we entered another ice age currently, it would increase the amount of locked water in the form of glaciers and hence it would have huge consequences for human civilization and the ecosystem.