1) lichens, represented by this symbiotic relationship, are responsible for or the establishment of a new site for plant growth. a) primary succession b) secondary succession c) trophic metamorphosis d) ecological infiltration

If animal agriculture was eliminated, how much grain would become available for human consumption?

Describe the two types of vascular tissue

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.