Much like a cell, a virus is able to grow in numbers. It however does not do so by binary fission as a cell does, but rather by a process called viral replication.
viral replication is a process that involves six steps and these are attachment, penetration, uncoating, replication , assembly and release.
Attachment - virus attaches to a host cell membrane or cell wall.
penetration - virus breaches the cell membrane and enters the cell.
Uncoating & replication, - viral DNA or RNA is realesed from virus and incorporated into the host cell own genetic material and induces it to produce multiple copies of the virus DNA or RNA and other protein parts of the protein
Assembly & release - the virus parts are put together to form whole viruses and these are released from host cell either by budding through or rupturing host cell membrane
Tundra ecosystem is cold and sunlight is short. Plants need sunglight and warmth in order to grow, thus plants in tundra are shorter and cloers to the ground since the ground is warmer than the air
Constants are factors that are not changed in the experiment. Since the experiment is testing different colors of light on plant growth, light color is being changed, and is therefore not a constant. Hope this helps! :)
Answer: 3.friction
Explanation: friction is a force of resistance acting between objects in contact and tending to dampen their motion