Which structures are common to both prokaryotic and eukaryotic cells? check all that apply

Which skill, if it cannot be performed by a 3-year-old child, should alert the nurse that the child may be developmentally delayed?

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.