What is the definition of cranial

Aseries of connections of food chain in an ecosystem is called a what

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

Which sets of mrna codons could genetically come for a protein with the following amino acid composition