Improvements in harvesting systems include all of the following advances EXCEPT trees are now cut closer to the ground.
trees are lifted by machine instead of manually.
trees can be transported using much smaller equipment.
trees grow at faster rates than they did in previous decades.

the sunflower because each experiment got the same results

hope this !

-payshence

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms