What happened when many water molecules come into contact with one another? explain.

The sides of the ladder or "backbone" of the polymer, DNA, is made out of these molecules:

How should we properly understand human nature?

Ammonite is a species of shellfish that is used as an index fossil. It has a distinct spiral. Which statement most likely explains why other species of shellfish that existed around the same period of time are not considered index fossils? A.

A harbor harvest is a regular amount of a renewable resource that can be harvested without reducing the future supply. T or F.

What description best present the arrangement of continents oceans and landforms according to the theory of tectonic plates?

Which of the following statements shows an example of operant conditioning? A.) A chicken learns that if it pecks on a button, a food pellet will be released into its cage. B.) Pavlov taught a dog to salivate every time it heard a bell. C.

A scientist has several specimens from the same time period from several thousand years ago. Which two specimens should he study so that he can learn about the amount of rainfall at that time and the kinds of plants that grew then?

Which is a characteristics of both plants and animals A. life cycles B. learned behaviors C. Produce their own food D. Reproduce using seeds

Case Study CryingBaby 1. What symptoms has Kayla exhibited over the first months of her life?

Why is meiosis needed?