Which part of an organism is preserved in cast and mold folds fossils?
A) skin
B) bone
C) muscle
D) soft tissue

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants

Acommon kind of mechanical weathering is called

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen