The human cardiovascular system is considered closed because a. blood is continuously circulated in the body. b. blood provides nutrients to organs. c. blood collects oxygen from the lungs d. there are no holes for blood to enter or leave the system

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2