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Exam Review 1

Across
The evolutionary history of an organism
The gamete-producing and usually haploid phase, producing a zygote
The internal membrane within an egg
The asexual and usually diploid phase of the plant life cycle
The branch of biology concerned with naming and classifying organisms
The process of using prokaryotes to clean up pollutants
Gives rise to tissues that line the gut cavity
Cannot survive in O2
The number and variety of Earth's species
Organisms with skulls
Gives rise to tissues that lie between the endoderm and ectoderm
Down
Small circular pieces of DNA that are often exchanged during conjugation
Nonflowering seed plants
A group that includes a number of closely related species
Infectious particles of protein
The process of transformation from an immature form to an adult form in two or more distinct stages
A rigid polymer that helps support a plant's body
The science of reconstructing phylogenies
Mammals that can lay eggs
Groups that include species linked by descent from a common ancestor