a process in which organisms with certain inhertied characteristics are more likely to survive and reproduce than are organisms with other characteristics differential reproductive success
A group of intracting individualsbelonging to one species and living in the same geographic area at the same time.
descent with modifications; genetic change in a population or species over generations; the heritable changes that heritable changes that have produced earths diversity of organisms.
any vertebrate of the class Mammalia, having the body more orless covered with hair, nourishing the young with milk from themammary glands, and, with the exception of the egg-layingmonotremes, giving birth to live young.
natural selection that acts in favor of the individual at one end of the phenotypic range
natural selection that favors extreme ove intermediate phenotpyes
A type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value.
random changes in the frequency of alleles in a gene pool, usuallyof small populations.
the alteration of the frequencies of alleles of particular genes in apopulation, resulting from interbreeding with organisms fromanother population having different frequencies.
the ability of a population to maintain or increase itsnumbers in succeeding generations.
a class of individuals having some common characteristics orqualities; distinct sort or kind.
the hypothetical landmass that existed when all continents werejoined, from about 300 to 200 million years ago.
adaptive change resulting in nonhomologous similarites among organisms species from different evolutionary lineages come to resemble each other as a result of living in very similar enviroments
air water light minerals and temperature
an enzymatic rna molecule that catalyzes chemical reactions
a spherical prokaryotic cell
a rod shaped prokaryotic cell
thesplitting of an atomic nucleus into approximately equal parts,either spontaneously or as a result of the impact of a particleusually with an associated release of energy
a poisionious protein secreted by certain bacteria
aposionious componant of the outer membrane of certain bacteria
the use of living thing orangisms to detoxify and restore polluted and degraded ecosystems
the interaction between organisms of different species the symbiont lives in or on another species the host.
a type of symbiosis in which one organism lives inside the other,the two typically behaving as a single organism.
a muturally beneficial symbiotic association of a plant root and fungus
Compare sporophyte the plant body, in species showingalternation of generations, that produces the gametes
in animals a tough no living outer layer of the skin in plants a waxy coatting on the surface of stems and leaves that help retain water
Compare gametophyte the diploid form of plants that havealternation of generations. It develops from a zygote andproduces asexual spores
the fertilizing element of flowering plants, consisting of fine,powdery, yellowish grains or spores, sometimes in masses
the tissue within the seed of a flowering plant that surrounds andnourishes the developing embryo
one of many filaments making up the body of a fungus
the densely branched network of hyphae in a fungus
an embryonic stage that marks the end of cleavage during animal development a hollow ball of cells in many species
the embryonic stage resulting from gastrulation in animal development most animals have gastrula made up of 3 layers, ectoderm endoderm mesoderm
a free living sexually immature form in some animal life cycles that may differ from the adult in morphology nutrition and habitat
the transformation of a larva into an adult
any cell having properties similar to an amoeba, such as shape,mobility, and ability to engulf particles
external skeleton that protects an aminal and provides points of attachment for muscles
interior skeleton located within soft tissues of an animal found in all veterbrates and a few inveterbrates
A flexible rodlike structure that forms the main support of the bodyin all chordates during some stage of their development. Invertebrates, the notochord develops into a true backbone in theembryonic phase. Primitive chordates, such as lancelets andtunicates, retain a notochord throughout their lives.
a protective flap on each side of a bony fish 's head that covers a chamber housing the gills
a shelled egg in which a embryo develops within a fluid filled amniotic sac and is nourished by yolk
the accumulated knowledge customs beliefs arts and other human products that are socially transmitted over the generations