Answer:
Scientists need instruments to measure the world. Instruments and sensors are needed to collect data - that takes engineering to design and build them.
Explanation:
When you observe and compare specific physical traits of different birds you will learn that some birds have characteristics that help them live and survive in their own habitat that other birds may not have but make up those birds have characteristics that help them in their own habitat.
One carbon atom has 4 valence electrons. Hope this helps
<span>An environmental factor that causes a population to decrease is death</span>
They are called prokaryotic cells
