Eliska is 9 months old. one of her favorite games is peek-a-boo, and recently she has begun to pry at her mother's fingers when mother covers her face. eliska has developed the understanding that mother is still behind her hands even when eliska can't see her.
a) sensory operations
b) concrete operations
c) conservation
d) object permanence

Which of the following is true regarding osmosis in bacteria cell?

1) earth's crust is made up of relatively rigid plates that ride atop earth's hot, semiliquid mantle. (2) the plates are called tectonic because they're in constant motion. (3) they can move because earth's mantle is a very hot and semiliquid fluid called magma. (4) volcanoes are a result of magma rising up or erupting through a plate, particularly where plate boundaries are moving against each other. (5) also, when plates slide against each other, causing friction along adjacent plate boundaries, earthquakes frequently occur. (6) therefore, we often find volcanoes and earthquakes along plate boundaries. (7) plates may also collide. (8) when that happens, mountain ranges are formed. (9) for example, the collision of the plate carrying the indian subcontinent created the himalayan mountains when it collided with the asian plate. 2. which sentence in this passage introduces a new topic that might begin a new paragraph? a. sentence 5 b. sentence 4 c. sentence 7 d. sentence 6

Idon’t understand 8. plz ! we are finding the area of polygons. thx in advance!