A single piece of coiled DNA is called a plasmid.
Answer:
Every time a new layer of water is added on the ice, another latyer of ice forms. The longer this happens (the more layers the ice has) the older the ice is. Similar to trees. The older a tree is, the more rings it has
Explanation:
Answer:
D) epithelial tissue
Explanation:
The exchange surfaces of the organisms are the site for an exchange of substances or gases. These surfaces mostly lie within the body and protect the exchange tissues. The exchange surfaces of multicellular organisms are lined with epithelial tissues. These tissues have tightly packed cells with little or no intercellular spaces. The epithelial tissues serve to protect the exchange surfaces. Sometimes, these epithelial linings are modified to perform an additional function. The exchange surfaces are finely branched or folded to have a very large area. The digestive, respiratory, and excretory systems all have such exchange surfaces.
Gastrulation marks the beginning of germ layer development in an embryo.A germ layer is a group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and tissues. The germ layers develop early in embryonic life, through the process of gastrulation.
