Why do scientific theories change over time?

Choose the best answer.

A. new technologies are developed

B. new discoveries are made

C. new research is conducted

D. all of the above

Nelly, a mother of two, adopts a particular hormonal method of birth control after which she notices her breasts swell up, and she has bleeding between periods. Which of the following hormonal methods is she most likely to have adopted? a.

Did your pulse change when standing? Why do you think a change did or did not occur?

Which biome would contain the most biodiversity in deciduous tree species? A) taiga B) savanna C) temperate forest Eliminate D) tropical rainforest

The ability to cause change in energy is known as

Mike works in the metals industry. which type of coal should he use as a fuel source?

What are four important ecosystem characteristics?

Why was one group given a sugar tablet as a placebo

The diagram shows the life cycle of a dragonfly. The adult stage occurs out of water, and the fertilized egg and nymph stages occur in water. Which two effects might a drought have on the life cycle of a dragonfly? A.

What is the phylum name?

Why can you see the cell membrane in cheek cells but not in onion or elodea cells