He birds shown above have beaks with three different shapes and sizes. these genetic variations in the black each appeared initially due to? - environmental factors - mutations - natural disaster - conscious choice by the birds

A fertilized egg cell is called

How is cell division different in prokaryotes and eukaryotes?

Which is the correct explanation for 120°W longitude? A. all positions along a circle that runs perpendicular to the equator and 120° west of the prime meridian B.

Which of the following is not a natural disturbance in an ecosystem? forest fire volcanic eruption air pollution drought

Select the best description of the negative selection process of lymphocyte maturation. A) teaching a lymphocyte to recognize "self" from foreign antigens B) removal of lymphocytes that react with "self" cells C) removal of lymphocytes that fail to

The shape and size of a birds beak would mostly be affected by what environmental limiting factor

Why do you think scientists use the word mutate to describe the genetic process shown in the video

Which best describes the purpose of a controlled experiment? A. to make sure the results of the experiment support the hypothesis B. to prevent a dangerous condition resulting from a reaction C.

Bones, joints, ligaments, and cartilage are parts of the a) refrigerator b) muscles c) skeleton

Chloroplasts cannot move on their own. How do they move around the cell?