Aperson’s skin cells and heart cells both have a complete copy of all of the person’s chromosomes. each cell, however, makes different types of proteins to perform its function. what is the source of the instructions from which all of the proteins are made? a. genes b. mitochondria c. gametes d. cell membrane

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a. earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c. earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

Which event would lead to primary succession of a forest?

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geographical equipment to analyze the composition of rocks