Which of these correctly shows ecological succession in a lava field? A. Soil is created. Moss and lichen arrive by birds to barren lava field. Fountain grass grows. Monkeypod trees grow.

B. Moss and lichen arrive by birds to barren lava field. Soil is created. Fountain grass grows. Monkeypod trees grow.

C. Moss and lichen arrive by birds to barren lava field. Fountain grass grows. Monkeypod trees grow. Soil is created.

D. Soil is created. Moss and lichen arrive by birds to barren lava field. Monkeypod trees grow. Fountain grass grows.

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is

92 sathe best for the question 11. most animals and plants reproduce sexually. this means that dna is passed down to new organisms from two parental organisms. which of the following is a key advantage of sexual reproduction?

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.