You will be given a passage, and your task is to generate a Yes/No question that is answerable based on the given passage.

LED grow lights vary in color depending on the intended use. It is known from the study of photomorphogenesis that green, red, far-red and blue light spectra have an effect on root formation, plant growth, and flowering, but there are not enough scientific studies or field-tested trials using LED grow lights to recommended specific color ratios for optimal plant growth under LED grow lights. It has been shown that many plants will grow normally if given both red and blue light. However, many studies indicate that red and blue light only provides the most cost efficient method of growth, plant growth is still better under light supplemented with green.
do red and blue led grow lights work?

The United States district courts are the general trial courts of the United States federal court system. Both civil and criminal cases are filed in the district court, which is a court of law, equity, and admiralty. There is a United States bankruptcy court associated with each United States district court. Each federal judicial district has at least one courthouse, and many districts have more than one. The formal name of a district court is ``the United States District Court for'' the name of the district--for example, the United States District Court for the Eastern District of Missouri.
are there district courts at the state and federal level?

There has been a great deal of debate in the past few years in the United Kingdom about whether to discourage cousin marriages through government public relations campaigns or ban them entirely. The debate has been prompted by a Pakistani immigrant population making up 1.5% of the British population, of whom about 50-70% marry a first cousin. In the 1980s researchers found that children to closely related Pakistani parents had an autosomal recessive condition rate of 4% compared to 0.1% for the European group. For example, Environment Minister (later Immigration Minister) Phil Woolas said in 2008, ``If you have a child with your cousin the likelihood is there'll be a genetic problem'' and that such marriages were the ``elephant in the room''. Physician Mohammad Walji has spoken out against the practice, saying that it is a ``very significant'' cause of infant death, and his practice has produced leaflets warning against it. However, Alan Bittles of the Centre for Comparative Genomics in Australia states that the risk of birth defects rises from roughly 2% in the general population to 4% for first cousins and therefore that ``It would be a mistake to ban it''. Aamra Darr of the University of Leeds has also criticized what she called an ``alarmist presentation of data'' that exaggerates the risk.

is it legal to marry your first cousin in england?