reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population.
Answer:
Habitat/Environment. Either can be right
The liver is the main site
Hey, mind putting the question in the replies so I can answer this? Thanks.
1. The cell wall has lignin (hard substance): to prevent the xylem vessel from collapsing and withstand high pressure.
2. The absence of protoplasm (nucleus + cytoplasm) and cross wall: to allow water to move through the lumen easily.
Hope it helped!