<span>The spicules have an important purpose for loosely constructed animal such as sponge. First of all, spicules give structure which is vital due to loose construction. Secondly, it protects from predators. This is similar to porcupine quills in serving to protect.</span>
Answer:
Scientists usually use the potassium-argon method to date rocks that are older than about 1 million years. Uranium-238 is also used for radiometric dating. It has a half-life of 4.5 billion years. It decays to produce lead-206.
Answer:
Option D
Explanation:
Diagram is attached.
Capsid protein is a form of structural protein which usually forms part of a complex which later produces protective shell around the nucleic acid in a virus. It is also referred to as coat protein or head protein.
Capsid acts as a distinguishing feature for identifying an integrated viral genome, plasmids and other genetic material of viruses. In fact, viruses are termed as organisms that encode capsid proteins.
Hence, option D is correct
When air is heated up the molecules spread out and move faster, so heat rises because it is less dense than the cooler air around it.
Most of the worlds deserts are located at latitudes where cold, dry air moving toward the poles descends.
E) cold, dry air moving toward the poles descends.
<u>Explanation:</u>
A large portion of the world's deserts are situated almost 30 degrees north scope and 30 degrees south scope, where the warmed tropical air starts to drop.
Hot deserts are essentially found around the Tropics of Cancer and Capricorn. As air moves inland, it gets drained of dampness and precipitation drops. So the majority of the world's deserts are situated at scopes where cool, dry air advancing toward the shafts slides.
