Answer:
1. Virus
2. Red Blood Cells
Explanation:
It just takes a quick google to know the answer
The answer to your question would be hypothesis
Answer:The different type of wing is most likely heritable, but i'm not sure.
Explanation:
Since the other answer got deleted, i'll just answer it for you.
a sinoatrial node is the main pacemaker that begins each heartbeat located in the junctions of superior vena cava and the right atrium. It signals from the node that spread through the atria and determines the heart rates.
Answer:
Lower levels of organization in multicellular organisms are cells, tissues and organs. These are followed by organ system and finally organisms. These levels are absent in unicellular organisms as they have only one cell and therefore no tissue and further levels.
