Why is the sarcoplasmic reticulum. how does it aid in the stimulation of muscle contraction?

Aplant has an egg with 34 chromosomes how many chromosomes does a leaf cell of that plant have

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.