A skeletal muscle<span> fiber is surrounded by a plasma membrane called the sarcolemma, which contains sarcoplasm, the cytoplasm of muscle cells. A muscle fiber is composed of many fibrils, which give the cell its striated appearance.</span>
Answer:
the answer is the second option.
carbohydrates, lipids, proteins and nucleic acids are biological molecules essential to sustain life in living organisms.
Answer: The digestive system metabolizes (breaks down) food using enzymes. The small intestine helps absorb 1.water and 2.nutrients necessary for life!
Explanation:
"A gene pool consists of all genes, including all the different alleles that are present in a population. Number of times an allele occurs in a gene pool compared with the number of times other alleles occur. In genetic terms, evolution is any change in the relative frequency of alleles in a population."
Answer:
True
Explanation:
The sinoatrial node is a small body of specialized muscle tissue in the wall of the right atrium of the heart that acts as a pacemaker by producing a contractile signal at regular intervals.
