PLEASE HELP 50 POINTS + BRAINLIEST Lloyd’s lab partner is looking down into a test tube while he heats the contents by using a flame. Which action should Lloyd recommend to his partner if heating must continue?

A: Wear safety goggles while looking into the opening of the test tube.

B: Cover the opening of the test tube so that no materials can boil out of it.

C: Move the test tube so that the opening is pointing away from all students.

D: Put the test tube in a hot water bath so that no water can enter its opening.

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas

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.

Asolution in which the salt concentration is higher outside the cell than the salt concentration inside the cell is called