C) Chromosomes are made of chromatin, which contains DNA and proteins.
Clams are adapted for burrowing in the mud and sand by having a short siphon (tube that intakes water) that allows them to expel mud and sand from their gils. They also have adapted by using their foot to dig down into the sand. The foot pushes down through the media and then the clam can pull it self down to the tip of their foot.
<span>Zircon is a zirconium silicate mineral which is ideal for use in age-dating. The importance of zircon as an age-dating tool include; its good hardness (which means makes it resistant to metamorphism, mechanical and chemical weathering), it is easy to chip, it undergoes radioactive decay and leads to damaged crystals, it is commonly found at many localities, and it has a very high lead versus uranium ratio which is used to determine the age of the rock.</span>