Across
- 4. ancestor An organism that is believed to be the ancestor of two or more different species.
- 5. A group of living organisms that share common physical and genetic traits and can interbreed to produce fertile offspring.
- 10. by natural selection The process by which organisms develop traits that are better suited to their environment through natural selection.
- 11. The long bone located in the thigh, between the hip and the knee.
- 12. The units of heredity that are passed down from parents to offspring and determine an organism's traits.
- 15. advantage A trait or characteristic that gives an organism an advantage over others in its environment.
- 18. The disappearance of a species or group of organisms from the Earth.
- 19. reproduction Reproduction that does not involve the fusion of gametes, resulting in offspring that are genetically identical to the parent.
- 20. of descendants The sequence of individuals or organisms that are directly related through a series of parent-child relationships.
- 21. The process by which certain traits or characteristics are favored or selected for in a population.
- 22. A group of individuals of the same species that live in the same geographic area.
- 25. record The collection of all the fossils that have been discovered and studied by scientists.
- 28. The remains or traces of a prehistoric organism that has been preserved in rock or other materials over time.
- 29. A group of living organisms that share common physical and genetic traits and can interbreed to produce fertile offspring, as defined by modern scientific classification systems.
- 30. An organism in the earliest stages of development, from fertilization to the end of the eighth week of gestation in humans.
- 31. The way in which individuals or traits are spread out or distributed within a population.
- 33. A type of bacteria that can cause illness in humans and animals.
- 34. Different forms of a gene that can result in different variations of a trait.
- 35. A distinguishing feature or quality of a person, animal, or thing.
Down
- 1. interactions The ways in which living organisms interact with each other and their nonliving surroundings.
- 2. A characteristic or trait that can be passed down from one generation to the next through genetic information.
- 3. A subset of a larger group or population that is studied or analyzed to make conclusions about the larger group.
- 6. ancestors Parents, grandparents, or great-grandparents who directly precede an individual in their family tree.
- 7. selection The process by which organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to their offspring.
- 8. A change in an organism's DNA that can result in a new trait or characteristic.
- 9. Nonliving factors or components of an ecosystem, such as temperature or soil.
- 13. ancestors The earliest known human or animal relatives from long ago.
- 14. Living factors or components of an ecosystem, such as other organisms or food sources.
- 16. A group of people or animals who are born and live around the same time, and are typically of the same age group.
- 17. The long bone located in the upper arm, between the shoulder and the elbow.
- 23. A specific characteristic or feature of an individual.
- 24. The biological children or descendants of a parent organism.
- 26. information The hereditary material, such as DNA or RNA, that carries the instructions for the development and functioning of an organism.
- 27. Differences in physical or genetic traits among individuals within a population.
- 32. Whiplike structures on the surface of some cells that allow for movement.