Which organisms in this food web can be described as both primary and secondary consumers?

A. Hawks

B. Weasels

C. Raccoons

D. Mice

the diffusion of substances across a cell membrane from an area of low concentration without the use of energy

An inversion occurs along part of a chromosome. How does the inversion most likely affect the region in which it occurs? A. Recessive alleles in the region become dominant alleles. B.

Chromosomes are strands of ADN wrapped around

In which biome would expect to find many coniferous trees?

Which term defines a well tested, scientifically supported statement that explains how something works? A. hypothesis B. law C. observation D. theory

Why must cell division be different between asexual reproduction and sexual reproduction? A. Sexual reproduction requires that the amount of DNA in a cell be halved. B.

Which of the following brings amino acids to the ribosome for use in translation? 1. rRNA 2. tRNA 3. mRNA

What is the process which cells in your body become different types of cells?

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?