Characteristics of physical properties include: (check all that apply) Group of answer choices

B. Properties that can be observed without changing the identity of the object or substance

A. Properties that we see through a change of color

D. None of these

C. Color, shape, size, density, density

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Consider the following reaction: 2h2 + o2 —> 2h2o a) what are the reactants in this reaction? b) what are the products in this reaction? c) how many molecules of oxygen are used in this reaction?

Crossing over is a method of (blank)?