The 150-million-year-old archaeopteryx fossil has birdlike features such as feathered wings, but it also has characteristics that we associate with living reptiles. which of the following are considered reptilian characteristics of archaeopteryx?
-long, bony tail
-claws on the ends of each digit in the "hands"
-teeth in the jaws

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Name the types of burns one can get and which structures of the integument are damaged

Approximately percent of the energy created by cell metabolism is used by the body to carry on its normal functions, such as respiration, digestion, reproduction, muscular movement, circulation, and cellular regrowth.