Answer:
the electron microscope
Explanation:
The first strands of DNA were observed through the electron microscope.
At two points close together toward the upper right of the diagram, since X and Y chromosomes are more advanced.
Answer:
Oxygen
Explanation:
Plants take in water, Carbon Dioxide and light to make oxygen for humans and animals to breath.
Answer:
He developed the theories of gravitation in 1666, when he was only 23 years old. Some twenty years later, in 1686, he presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis." The laws are shown above, and the application of these laws to aerodynamics are given on separate slides.
Explanation:
Answer AND Explanation:
Darwin describes natural selection as a process whereby nature selects those organisms that have favourable characteristics to be parents of the next generation. The individuals possessing the favourable traits are better suited to the prevailing environmental conditions. This enables them to stand a better chance to survive in the struggle for existence due to limited resources.
