They are all made up of matter. Some are compounds and some are elements. They all contain atoms.
Answer:
The correct answer is - Cytosine pairs with guanine and thymine pairs with adenine.
Explanation:
In a real DNA or B-DNA the interaction or arrangement of the nitrogen bases are defined and almost remain the same. The bond between the nitrogen bases is hydrogen bonds.
The hydrogen bond between the purine and pyrimidines (types of nitrogen bases) are as follows:
Adenine always pairs with Thymine and Guanine always pairs with Cytosine in a real DNA molecule.
Answer:
<em>I stopped to think for a moment, and realized </em><em>chemical energy</em><em> is found in food. Then, I thought about how the other day when I saw lightning, that is an example of </em><em>electric energy</em><em>. Then I thought about how when throw a ball, that is a form of </em><em>kinetic energy</em><em>. The other day, when I was hammering a nail into a piece of wood, that was a form of </em><em>mechanical energy</em><em>. An example of </em><em>nuclear energy</em><em> would be the nuclear power plant by our house. Before my book fell off my table, this is an example of </em><em>potential energy</em><em>. The energy from the sun is an example of </em><em>radiant energy</em><em>. Volcanoes and earthquakes around the world are an example of </em><em>seismic energy</em><em>. </em><em>Sound energy</em><em> would be the balloon that I popped the other day. </em><em>Thermal energy</em><em> would be the heat I feel from the heater.</em>
Answer: The correct option is B. Vertebrates appeared in the oceans before they moved on to land.
Vertebrate paleontology involves study of fossils of the vertebrates starting from the earliest fishes to the ancestors of modern day mammals. The spreading up of life from water to land needed modifications and adaptations such as protection from drying and support against the gravity. The tetrapod vertebrates evolved and started to live on land from oceans during the Devonian period. The succession of the Devonian period showed fossil evidences towards terrestrialization
.
It was carried there by wind or waves