Sinlge-celled organisms and soft, boneless animals. Back then organisms were single-celled and simple.
Perch have paired pectoral and pelvic fins, and two dorsal fins, the first one spiny and the second soft. These two fins can be separate or joined.
An ant is considered a scavenger!!
Hope this helps!
Answer:
Mutations in the HBB (beta-globin) protein causes symptoms of sickle cell disease.
