Uyou read ine chapter, respond to these statements.
1. write an a if you agree with the statement.
2. write a d if you disagree with the statement.
before you read
after you read
communities, biomes, and
ecosystems
once an ecosystem is established, its
plant and animal species remain the
same.
over time, a forest can develop from
bare rock
mountains are not a biome because
climate, plants, and animals change with
elevation.
most of earth's freshwater is locked
in ice.
science journal

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.