The answer is 'Cambrian' explosion. This took place approximately 541 million years ago. 'Explosion' refers to the evolution of a large range of new major animal phyla. Scientists know this by the large number of diverse fossils from this period. Prior to this period, organisms were single-celled, but over the Cambrian Explosion, lasting about 80 million years, life forms diversified rapidly to resemble the life forms existing today.
Energy is required for the normal functioning of the organs in the body<span>. Many tissues can also use fat or protein as an energy source but others, such as the brain and red blood cells, can only use </span>glucose<span>. </span>Glucose<span> is stored in the </span>body<span> as glycogen. The liver is an important storage site for glycogen.</span>
Answer:
Sarcomere
Explanation:
A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments—actin and myosin—which are the active structures responsible for muscular contraction.
the genetic material housed inside the cell nucleus is packaged in into these organized bundles.
- chromosomes
