It would be secondary. This is because a natural disaster would cause an immediate effect on plant life in the area.
Answer:
Since genetically engineered (GE) crops were introduced in 1996, their use in the United States has grown rapidly, accounting for 80-90 percent of soybean, corn, and cotton acreage in 2009. To date, crops with traits that provide resistance to some herbicides and to specific insect pests have benefited adopting farmers by reducing crop losses to insect damage, by increasing flexibility in time management, and by facilitating the use of more environmentally friendly pesticides and tillage practices. However, excessive reliance on a single technology combined with a lack of diverse farming practices could undermine the economic and environmental gains from these GE crops. Other challenges could hinder the application of the technology to a broader spectrum of crops and uses.
Explanation:
DNA serious as the Molecular
Basics for life DNA copies itself VIA the process of replication,
Answer:
Fossil record
Explanation:
Fossil record provides historical data documented by fossils, remains of organisms from earlier geological period that have been kept or preserved in rooks.
Morphology is the study of the shape or structure of a thing.
Radiometric data is the use of gamma rays to date rocks or carbon.
From the definitions above, only fossil records can be used to calibrate the clock, by providing information about lineage divergence, from fossils.
Color change, gas released, volume change, temp change
