4. What domain name should replace the question mark in this chart? * 5 points
Unicellular Protozoa
Uni/multicellular
algae
Multicellular
heterotroph
cell walls chitin
?
Multiceullular
autotroph
cell walls
of cellulose
Multicellular
heterotroph
Lack cell walls

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?