Which best describes the structure of DNA?

A. Alleles held together by genes

B. A tetrad with two sister chromatids

C. Nucleic acids arranged in a double helix

D. Chromosomes linked in a loop

What causes the amount of salt in the water of an estuary to change?

Adrienne has a pet mollusk. Lately she noticed that her pet has learned how to escape its tank. What kind of mollusk is Adrienne's pet? What makes you believe this?

Schizophrenia that develops gradually over a long period of time is called

Crustaceans are well adapted to life on the rocky shore because they have? A) Soft shells B) Internal skeletons C) Camouflaged color patterns D) Holdfasts

T or f A red-shift indicates that objects are moving toward Earth

Description and function of a phospholipid

English maths biology physics account

Hallie and Jamar built a prototype bridge for a science competition. According to competition guidelines, their final design must hold at least 2 kilograms and span a gap of 0.5 meters. They built a bridge that is 0.75 meters long.

Some hazardous waste is disposed of by deep-well injection. This procedure Select one: a. All of the above b. pollutes the wells and water supplies of nearby residents. c. violates federal law. d.

Which instrument should give the most accurate measurement of water temperature