How can embryos help scientists understand evolution? A. Embryos contain the code for all life on Earth.
B. Embryos provide evidence for which life forms existed at the same time.
C. Embryos are frequently fossilized and illustrate change over time.
D. Embryos go through various stages that suggest the animal’s evolutionary process.

What is the mrna strand that would be copied from this dna strand

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.