Question

1. Name 2 (or more) species which are endothermic, produce milk, can develop a complete placenta, & exhibit care of their offspring.
   1. Opossum, Wolf                                                 c. Dolphin, Hippopotamus
   2. Echidna, Tiger                                                    d. Giraffe, Wallaby
2. Many archaea & true-bacteria species share several biochemical needs with typical animal species (including humans) & are metabolically classified as:
   1. Strict (obligate) anaerobes                          d. -Strict (obligate) aerobes
   2. Facultative anaerobes                                   e. Micro-Aerophiles
   3. All are possible in animals                            f. -None are possible in animals

Answer 1

Ans 1: C) Dolphin, Hippopotamus - Endothermic animals are those that maintains a constant body temperature independent of the external environment, they are also known as warm blooded animals. All the above mentioned animals are endothermic. But the difference comes in they way they reproduce. Most mammals are placental mammals and are called eutherian that possess chorioallontoic placenta. Eg: Humans and Dolphins etc. Marsupials like opossum, monotreme like echidna and wallabies handles pregnant differently.

Ans 2: C) All are possible in animals. Bacterias and Archaea are of different types each with different characteristics. Only Eubacteria are the members of bacteria that are true bacterias. And true bacterias are those that possess a rigid cell walls and are motile types. Strict or Obligate Anaerobes Eg: Clostridium botulinum (motile bacterium). Strict or Obligate Aerobes Eg: Bacillus subtilis (motile bacterium). Facultative Anaerobes Eg: E. coli (usually motile) and Micro-Aerophiles Eg: Campylobacter jejuni (motile).