Group of tissues performing a specific task is known as organ and group of organs performing a specific task is organ system.
Your answer would be valence electrons, i believe.
Answer:
The correct answer is option C. "2+".
Explanation:
A common procedure to test for the presence of antigens is to perform an agglutination reaction by performing an antibody screen. In an agglutination reaction that is graded 2+ the red blood cells start to be broken and medium-sized agglutinates are formed. In this reaction no red blood cells are free, only agglutinates are seen at the bottom of the microtubes. The characteristics of the reaction herein described concur with an agglutination reaction that is graded 2+.
Answer:
1. hydrogen; 2
2. it means two strands of DNA twisted around each other like a winding staircase
