Answer:
The three types of rocks are Igneous, Sedimentary, and Metaphoric.
Explanation:
<em>Igneous</em> rocks are formed out of melted rocks deep inside the Earth. A distinguishing unique characteristic is that they are hard.
<em>Sedimentary</em> is formed from layers of sand, silt, dead plants, and animal skeletons. A distinguishing unique characteristic is that they are easy to crumble.
<em>Metaphoric </em>are formed when minerals change through heat and pressure underground. Two distinguishing unique characteristics are that they may have many layers and are noticeably hard.
Marine organisms at higher trophic levels will have higher concentrations than animals in lower trophic levels. This is because mercury is not easily eliminated from these organisms so the concentration can increase as you go up the food chain. For example, one fish eats five shrimp each with one molecule of mercury, the fish now contains five molecules. If a larger fish eats several fish with five molecules of mercury then the concentration increases through the trophic levels.
Answer:
The correct answer will be option-C.
Explanation:
The muscle contraction occurs as a result of the sliding of the myofilaments made up of thin actin filaments and thick myosin filaments. The actin contains a binding site for the myosin which is covered with the tropomyosin-troponin complex proteins.
The troponin contains a binding site for the "calcium" which is released from the sarcoplasmic reticulum in response to the nerve signals. The calcium binds the troponin and causes conformation changes in tropomyosin which exposes the myosin-binding sites to bind myosin. The myosin binds and forms cross-bridge and cause muscle contraction.
Thus, Option-C is the correct answer.