Are radioactive elements natural and not harmful

What variables could influence the width of marine magnetic anomalies on the floor of the ocean?

Is a scientist who studies plant remains in the archaeological record. a. ethnologist b. zooarchaeologist c. paleoethnobotanist d. paleontologist?

The amount of carbon dioxide in atmosphere would greatly increase if there were fewer

What do scientists call regions of Earth that contain an unusually large number of species that are threatened by habitat loss?

What are the characteristics of each of Earth's Layers?

Enzymes are made of protein and a non protein therefore they can not be denatured? True or false?

Who was the first person to attempt to classify the living organisms on earth?

Samples as small as a few skin cells can potentially contain DNA. T/F

At times, the only fossil remains of a dinosaur biped are its footprints. Scientists use footprints to estimate the dinosaur's size. In bipeds, the footprint length is about one quarter to one fifth the length of the dinosaur's leg.

Critical thinking predicting if a woman with type o blood and a man with type ab blood have children, what are the children's possible genotypes?