Problem: - Water levels of a river or lake get higher - Water builds up on the ground - Water covers streets - Water gets deep in some places - Water goes into houses and other buildings - The rain stops or the dam is repaired - Water flows into streams - The rest of the floodwater evaporates. What might be the first step of the process?

A: There is a lot of rain or a dam breaks

Problem: - The egg hatches - A larva emerges - The larva eats and grows - The larva sheds its skin - The larva enters a chrysalis - The pupa grows inside the chrysalis - The adult butterfly exits the chrysalis - The adult butterfly is now fully grown - The adult butterfly lays more eggs. What might be the first step of the process?

A: A butterfly starts as an egg

Problem: - The bird collects bits of sticks and grass - The sticks and grasses are placed between support branches - Leaves, mud and spider webs are added to the sticks - The mud, leaves and webs glue the sticks together - The solid nest supports the eggs - What might be the first step of the process?

A: A bird picks a spot high spot, often in a tree

Problem: - The trees die off - The dead material provides nutrients for more trees - The rising trees provide shelter - And more organisms begin to thrive - The ecosystem known as a forest is made. What might be the first step of the process?

A:
Networks of trees start forming