Which type(s) of economies interact with other economies? a. only closed economies b. only open economies c. closed economies and open economies d. neither closed nor open economies?

b. only open economies

A closed economy is a self=sufficient economy and does not need trade activity with outside economies. There are no imports and exports.

An open economy is its opposite. It is the type of economy which interact with other economies.

Trade exists in many forms like  managerial exchange, technology transfers, and all kinds of goods and services. Economic advantages for citizens of a country with an open economy: 1) Consumers have larger variety of goods and services from which to choose and 2)  they have the opportunity to invest their savings outside the country. 

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times