1) It refers to the cumulative change in a population of organisms over time. 2) These are the remains of dead plants and animals of long ago. 3) Organs that have different functions but have similarities in structures. 4) These are structures which serve similar purposes yet are found in species that have come from different evolutionary lines. 5) Rudimentary structures with no apparent use at present but resemble useful structures in ancestral relatives. 6) It is the chance change in the frequency of a mutation in a population from one generation to the next resulting from the finite size of a population. 7) Also called migration, it is any movement of individuals, and/or the genetic material they carry, from one population to another. 8) It is the mechanism that causes evolutionary change, helping organisms adapt to their environment. 9) It is the practice of identifying different organisms, classifying them into categories, and naming them. 10) It is the study of how nature works. 11) It is a specific area where different kinds of organisms obtain their food, water, shelter, and other things needed to survive and reproduce. 12) It is the functional role an organism plays within an ecosystem.  13) It refers to the order of events in an ecosystem, where one living organism eats another organism, and later that organism is consumed by another larger organism. 14) This transfer of energy explains how food chains overlap. 15) It is the conversion of a liquid into vapor, at temperatures below the boiling point. 16) It is the conversion of vapor or gas to a liquid. 17) Any kind of weather condition where something's falling from the sky. 18) It is essential for all forms of life because nitrogen is required to biosynthesize basic building blocks of plants, animals, and other life forms, e.g. nucleotides for DNA and RNA and amino acids for proteins. 19) It is the process where microscopic organisms like bacteria or other types of decomposing organisms, break down nitrogen containing chemicals from dead organic matter, into simple substances like ammonia. 20) It is an aerobic process where ammonia is oxidized into nitrites then the nitrites get oxidized into nitrates. 21) The biological reduction of nitrate (NO3) to nitrogen gas (N2) by facultative heterotrophic bacteria.

The Process of Evolution and the Interaction & Interdependence of Living Things

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