_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative