Across
- 5. Vascular tissue that transports water throughout a plant's body. The complex processes and various cell types constitute xylem transfer water and dissolved nutrients to maintain and nourish plants.
- 6. An animal, as the horse or cat, that has been tamed and kept by humans as a work animal, food source, or pet, especially a member of those species that have, through selective breeding, become notably different from their wild ancestors.
- 7. A deviation from the norm, like the variation of colors in nature. A variation from an accepted standard can be very important. For example, a variation in a heartbeat pattern can tell a doctor that a heart attack might be imminent.
- 8. A rounded underground storage organ present in some plants, notably those of the lily family, consisting of a short stem surrounded by fleshy scale leaves or leaf bases, lying dormant over winter.
- 10. A modification of an organism or its parts that makes it more fit for existence. An adaptation is passed from generation to generation
- 11. The seasonal movement of animals from one habitat to another in search of food, better conditions, or reproductive needs.
- 12. Involves choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics. Humans have selectively bred plants and animals for thousands of years including: crop plants with better yields
Down
- 1. A mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes species to change and diverge over time.
- 2. Defined as all nationals present in, or temporarily absent from a country, and aliens permanently settled in a country. This indicator shows the number of people that usually live in an area. Growth rates are the annual changes in population resulting from births, deaths and net migration during the year.
- 3. A change in the DNA sequence of an organism. Mutations can result from errors in DNA replication during cell division, exposure to mutagens or a viral infection.
- 4. All of the offspring that are at the same stage of descent from a common ancestor. The average interval of time between the birth of parents and the birth of their offspring.
- 9. A group of organisms that consist of similar individuals capable of interbreeding or exchanging genes among themselves. In biology, species is the most basic unit of classification, as well as a taxonomic rank. The next taxonomic rank on the hierarchy of biological classification is a genus.