What is the property that is most similar among all elements across one whole period called ?

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin

Which of these would most likely be a stimulus that would cause the body to initiate feedback mechanisms a.) normal body temperature in an arctic environment b.) normal boy temperature in a tropical environment c.)light physical activity d.)low blood sugar