What components of the introns of nuclear genes that encode proteins in higher eukaryotes are conserved and required for the correct excision of intro sequences from primary transcripts by spliceosomes?

Four types of motile cells in human body?

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Me the formula cacl2 represents the compound