Mammals are characterized by
a. warm-bloodedness and feathers.
b. hair and feathers.
c. mammary glands and hair.
d. hair and shelled eggs.

What are the student's observations and inferences before he starts his investigation?

Which of these is not an example of molecular homology? 1. use of dna and rna as genetic material 2.use of glycolysis as the first step in cellular respiration in both plants and animals 3. the lack of an igf-1 gene in prokaryotes 4. the use of aldolase b to break down fructose in bacteria, plants and animals

The arrows in the illustration point to