Why can’t the producers in some ecosystems make an unlimited supply of organic material?

What best describes the structure of the declaration of independence?

Joseph lives in a country that lacks basic social infrastructure. moreover, the banking system is not managed properly. the level of education is low. in which type of country is joseph residing? generally, what is the trend of fertility rate in such countries?

Amale carrier of a recessive somatic mutation marries a female without this mutation. what is the probability that their child will be a carrier? a. 0% b. 25% c. 50% d. 100%