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

What would happen to male fetus whose gonads could not produce testosterone A. It would develop ovaries instead of testes B. It would not develop male genitals C. It could not produce Mullerian inhibiting hormone D. It would produce estrogen E.

Competition is only a problem for those on the lower levels of the food pyramid. A. True B. False

3. What happens to the energy that is consumed by any level in an energy pyramid?

Ocean crust is best described as A. Thin and young B. Continuously replenished C. Majority of earths crust D. All of the Above

Scarlet (st) is recessive to wild type (st+) and sepia (se) is recessive to wild type (se+). Both genes are located on chromosome 3 in Drosophila melanogaster.

What is the source Code of transcription

One of the primary functions of DNA in cells is to A. Serve as a storage firm for unused nucleotides B. Occupy space in the nucleus to keep the nucleus from collapsing C. Copy itself exactly for new cells

What feature do lymphatic vessels share with veins that allows lymph to flow in only one direction?

The negative stain is used to the negative stain is used to determine cell size. visualize endospores. determine flagella arrangement. visualize the outer membrane. determine gram reaction.

The visible part of the ear has the ability to stretch significantly, and then recoil back to its original position. Which protein fiber must be present?