How does the diagram between paragraphs 9 and 10 contribute to the reader's understanding of the
passage?
1. It clarifies how electrons flow between a battery
and the device it powers.
t
nd
2. It emphasizes how much energy can be
produced in relation to the size of its source.
3. It reveals that electromagnetic fields tend to
cause objects that are placed within them to
move.
4. It demonstrates how easily the power from
batteries can be transferred to magnetically
levitated trains.

The study of interaction between living organisms and their enviroment is called (a) phytogeography (b) ecology (c) phytosociology (d) ecosystem

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?

Archeologists have discovered three sites showing conclusive evidence for the mastery of fire in tanzania, from a period slightly after the time that homo habilis was present in africa. these sites clearly were founded by homo erectus, the descendent species of homo habilis that migrated north, out of africa and into asia. homo erectus was known to have mastered fire, from ample evidence at sites in asia. there is no reason to attribute mastery of fire to homo ergaster, the descendent species of homo habilis that remained in africa.which of the following is an assumption on which the argument depends? (a) before their migration, homo erectus occupied african territory as far south as tanzania.(b) the strain of migration provided the selective pressure motivating homo erectus‘ mastery of fire.(c) homo ergaster would not have derived as much benefit from the mastery of fire as did homo erectus.(d) homo ergaster inherited all cultural knowledge from homo habilis, a species that did not have mastery of fire.(e) homo ergaster did not occupy regions as far south as tanzania until well after the time of these three sites.