Construct a chart to contrast mitosis and meiosis. include the following:
a. the number and type cells produced
b. the number of replications of dna
c. the number of actual divisions of cells
d. the formation of tetrads (pairs of homologous chromosomes)
e. the use of the terms diploid and haploid in the resulting cells

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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