Which statement best explains why embryology is useful to taxonomists.
a. an embryo develops through a series of cell divisions.
b. comparing the development of embryos reveals evolutionary relationships.
c. embryos are usually well preserved as fossils.
d. embryos undergo a series of metamorphic changes.

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.