Is the unlimited source of energy for all living things is the leaf. is that true or false

Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?