If geologists use radioactive dating to determine the age of rock layers, then what do geologists use to determine the age of rock layers? Answer choices: - Chemical dating - Mechanical dating - Non radioactive dating - blastoids - single-celled organisms - Seismometer - Radioactive dating - an electron microscope
Radioactive dating

If all organisms remove waste from their body, then what is one thing all organisms do? Answer choices: - Eat food through the mouth - converting mass to energy - Remove waste from the body - Walk on two legs - eat plants or other animal - by keeping them warm - produce offspring - Hatch from eggs
Remove waste from the body

Q: If arthropods are animals without a backbone, then what don't arthropods have? Answer choices: - an exoskeleton - legs - Bodily water - Damaged hearing - kinetic energy - a backbone - Energy - backs
A: a backbone

Question: If telephones are used for communication by two people by transmitting waves, then what are used for communication by two people by transmitting waves? Answer choices: - satellites - A Greek letter - Morse code - mitosis - telephones - energy - electricity - photosynthesis
Answer: telephones

*Question*
If bacteria are single-celled organisms that lack a nucleus, then what are single-celled organisms that lack a nucleus? Answer choices: - ferns - barnacles - Most plants - cacti - Leeuwenhoek - orchids - bacteria - PDAs
**Answer**
bacteria

If deoxyribonucleic acid contains genetic instructions, then what contains genetic instructions? Answer choices: - Most plants - Chlorophyll - Plant reproduction - red hair - deoxyribonucleic acid - freckles - Veins and arteries. - h2o
deoxyribonucleic acid