All animals and plants are made of cells. Animal cells and plant cells have features in common, such as a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes. Plant cells also have a cell wall, and often have chloroplasts and a permanent vacuole.
Asker's rating. Report Abuse. You can stay outside for up to 2 years with a re-entry permit ...but you must keep a presence here ..home, bank account ..etc but for stays of over 6 months its best to get one a green card is for living here ...if you are not doing that you eill lose it. David Â· 6 years ago. Thumbs up. 2.
As of 1 June 2009, all Canadian citizens (16 years or older) require a passport, NEXUS card or enhanced driver's license to enter the US via land or water. In addition, each holder of Canadian passport is entitled to 180 days or 6 months visa free stay in the United States.