The decay that causes this change is called radioactive decay
It depends on where you live like mines Tampa FL cause I live in Florida theres others in FL but thats the one I used when I went on a cruise.
Hello!
To change singular nouns to plural nouns, you add an -s if the ending letter is a vowel. If the last letter is a consonant, you add -es.
To change plural nouns to singular nouns, you remove the -s or -es.
To change "las casas", a plural noun, into a singular noun, it would be "la casa".
Therefore, the singular form of "las casas" is la casa.