Which statements describe the fossil record? check all that apply.
there is very little fossil evidence for the first 4 billion years of earth.
there is very little fossil evidence for the last 600 million years of earth.
most of the fossil evidence is from the first 4 billion years of earth.
most of the fossil evidence is from the last 600 million years of earth.
the fossil record is complete.
the fossil record is not complete.

Anurse is caring for a 42-year-old client who is scheduled for an amniocentesis during the fifteenth week of gestation because of concerns regarding down syndrome. what other fetal problem does an examination of the amniotic fluid reveal at this time?

All ova contain sex chromosomes corresponding to: x y xx xy

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.