Chapter 12 Word Scramble
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Term | Definition |
evolution | change over time |
radiometric dating | estimation of the age of an object by using certain chemicals (half life) |
4.5 billion years ago | How old is Earth? |
prokaryote | simple cell, single cell (unicellular), no nucleus |
eukaryote | complex cell, single or multicellular, has a nucleus |
cyanobacteria | through photosynthesis, they added oxygen into the water and air, making the atmosphere right for land organisms |
6 Kingdoms | 1 eubacteria (common bacteria) 2 archaebacteria (extreme bacteria) 3 protists 4 fungi 5 plants 6 animals |
multicellular | 2 or more cells, allowed for specialization of cells (each cell has its own job) |
extinction | death of all members of a species |
ozone layer | protects Earth from the harmful UV rays of the sun, allowed life to move onto land |
Eras of life on Earth | (Precambrium time), Paleozoic Era, Mesozoic Era, Cenozoic Era |
fossil | the remains of a living organism, can be dated by radiometric dating |
mutualism | relationship between 2 species in which both species benefit (mycorrhizae is an example) |
mycorrhizae | a relationship between fungi and plants, plants receive minerals from the fungi and fungi receive food from the plants |
arthropods | 1st species on land, they have an exoskeleton (outer), they are invertebrates (no backbone), they include lobsters, crabs, insects and spiders |
vertebrates | they have a backbone (endoskeleton) |
amphibians | they can live in water and land, eggs are laid in water, they include frogs, toads and salamanders |
reptiles | live on land, 1st to lay eggs on land, they include snakes, lizards, turtles and crocodiles |
mammals | they have hair, feed their young with milk, live birth (humans) |
continental drift | movement of land masses over Earth's surface (Pangea) |
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