Carbon atoms have four valence electrons. Oxygen atoms have six valence electrons. Carbon and oxygen can share electrons so that each atom obtains a full outer shell of 8 valence electrons. Draw the shared electrons on this diagram.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

a. suckling by young

b. hypothalamus

c. dopamine

d. trh

e. anterior pituitary

f. mammary glands

g. milk production

correct answer is a. and d.