An ice age is a period when large expanses of ice sheets cover the land. millions of years ago, an ice age occurred on earth. fossils of animals buried under this ice were obtained. the organisms were frozen solid shortly after death, which made them: 1original-tissue fossils 2mineralized fossils 3trace fossils . a mass extinction occurred during this period, which means that: 1many species migrated from one place to another 2 many species were wiped out 3 many species emerged during the ice age .

Which organelle releases chemicals that break down large food particles into smaller ones?

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods? yy  ´    ´    ´    ´  yy