animals

Edit Answers
123456789101112131415
Across
  1. 2. have segmented body, an exoskeleton and legs with joints
  2. 3. toothless: they have beaked jaws. They lay hard-shelled eggs. They have a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
  3. 9. a successful phylum of marine animals. They include sea stars, brittle stars, sea urchins, sea cucumbers and their relatives.
  4. 10. are small terrestrial invertebrates which have a hard exoskeleton.they are the largest group of animals on earth by far: about 926,400 different species have been described.
  5. 11. without backbones
  6. 12. a member of the phylum Porifera. It is a simple animal with many cells, but no mouth, muscles, heart or brain. It is sessile: it cannot move from place to place the way most other animals can
  7. 15. are the largest phylum of animals without a body cavity. Flatworms can be found in marine, freshwater, and even damp terrestrial environments.
Down
  1. 1. not parasites, they are free-living. They live in soil and feed on bacteria. C. elegans is a model organism, used to study animal development and behavior. It is the first multicellular organism for which scientists have been able to sequence its whole genome.
  2. 4. cold blooded, have scaly skin, and lay cleidoic eggs.
  3. 5. are an important phylum of invertebrate animals. Most of them are marine. They have huge numbers in-shore, that is, in shallow wahe largest marine phylum, with about 85,000 living species, 23% of all named marine organisms. They also occur in freshwater and on land.
  4. 6. members of the class Amphibia. The living ones are frogs (including toads), salamanders (including newts) and caecilians. They are four-legged vertebrates which are cold blooded.
  5. 7. with backbones
  6. 8. vertebrates which live in water and respire (get oxygen) with gills
  7. 13. a group of vertebrate animals which form the class Mammalia. They have fur or hair and a very precise kind of temperature regulation.
  8. 14. worms- can be found in most wet environments. Some of these species are parasitic or mutualistic. This means they live together with (or inside) another organism. A mutualistic relationship is beneficial to both organisms