The mental health of teenagers has sharply declined in the last 25 years and the chances that 15-year-olds will have behavioural problems such as lying, stealing and being disobedient, have more than doubled.
The study looked at three generations of 15-year-olds, in 1974, 1986 and 1999. Behavioural problems increased over the whole period, while emotional problems were stable until 1986 and have subsequently shot up.
The rate of emotional problems such as anxiety and depression has increased by 70% among adolescents, according to the biggest time trend study conducted in Britain.
The increases cannot be explained by the rise in divorce and single parenthood, argues the team of researchers, because they found comparable increases in all types of families, although there is a higher rate of adolescent mental health problems in single-parent families.
Boys are more likely to exhibit behavioural problems and girls are more likely to suffer emotional problems. The rate is higher for emotional problems, now running at one in five of 15-year-old girls. The study found no increase in aggressive behaviour, such as fighting and bullying, and no increase in rates of hyperactivity.
Nor can growing inequality over the 25 years explain the rise in problem teenagers because rates of increase were comparable in all social classes. There was no difference between white and ethnic minority teenagers.
The r e search found that the rising rate of 15-year-olds with behavioural problems correlated to their increased chances of experiencing a range of poor outcomes as adults, such as homelessness, being sacked, dependency on benefits and poor mental and physical health. This indicated that the rise in problems cannot be attributed to a greater likelihood to report them. The deterioration of adolescentsâ€™ mental health in Britain is in contrast to the findings of research in the US
which showed that a comparable decline tailed off in the 90s, while in Holland, there was no decline at all.
According to the World Health Organisation, overcrowding refers to the situation in which more people are living within a single dwelling than there is space for, so that movement is restricted, privacy secluded, hygiene impossible, rest and sleep difficult. The terms crowding and overcrowding are often used interchangeably to refer to the same condition. The effects on quality of life due to crowding may be due to children sharing a bed or bedroom, increased physical contact, lack of sleep, lack of privacy, poor hygiene practises and an inability to care adequately for sick household members. While population density is an objective measure of number of people living per unit area, overcrowding refers to peopleâ€™s psychological response to density. But, definitions of crowding used in statistical reporting and for administrative purposes are based on density measures and do not usually incorporate peopleâ€™s perceptions of crowding. This report is examining the effects that plants growing in overcrowded conditions go through
and what affects overcrowding has on seedlings making comparisons to plants which have been grown in normal/ideal special conditions. It also includes literature research into the different methods which are used for the growth of plants in both commercial settings and private setting and which method suits this investigation s purposes best. It gives results in both observational and quantitative ways and explains/ gives definitions for words that may not have been understood. There are a number of factors that affect plant growth, including sufficient light, water, soil and soil nutrients. Overcrowding will affect plant growth in many ways, including encouraging the development of diseases, hampering fruit and flower production, stimulating insect and pest problems and influencing the overall growth and development of a plant. Plants have a natural defence mechanism called allelopathy that is designed to prevent overcrowding and protect them from its consequences.
зелень Calaveras Big Trees State Park is a state park of California, USA, preserving two groves of giant sequoia trees. It is located 4 miles (6.4 km) northeast of Arnold, California in the middle elevations of the Sierra Nevada. It has been a major tourist attraction since 1852, when the existence of the trees was first widely reported, and is considered the longest continuously operated tourist facility in California. The area was declared a state park in 1931 and now encompasses 6,498 acres (2,630 ha) in Calaveras and Tuolumne Counties. Over the years other parcels of mixed conifer forests, including the much larger South Calaveras Grove of Giant Sequoias (purchased in 1954 for $2.8 million USD), have been added to the park to bring the total area to about 26 square kilometres (6,400 acres). The North Grove contains about 100 mature giant sequoias; the South Grove, about 1,000. The North Grove included the ‘Discovery Tree’ noted by Augustus T. Dowd in 1852 and felled in 1853, leaving a giant stump which is the only remainder of the tree. It measured 24 feet (7.3 m) in diameter at its base and was determined by ring
count to be 1,244 years old when felled. However, the largest tree was believed to be the Mother of the Forest, which was cut down in the mid-nineteenth century and dwarfed any tree alive today. In addition to the popular North Grove, the park also now includes the South Grove, with a 5-mile (8.0 km) hiking trip through a grove of giant sequoias in their natural setting. The South Grove includes the Louis Agassiz tree, 250 feet (76 m) tall and 25 feet (7.6 m) in diameter 6 feet (1.8 m) above ground, the largest tree in the Calaveras groves. It is named after zoologist Louis Agassiz (1807–1873). Other activities include cross-country skiing, evening ranger talks, numerous interpretive programs, environmental educational programs, junior ranger programs, hiking,
mountain biking, bird watching and summer school activities for school children. Dogs are welcome in the park on leash in developed areas like picnic sites, campgrounds, roads and fire roads (dirt). Dogs are not allowed on the designated trails, nor in the woods in general.
ветвь Because of the enormous quantity of branches in the world, there are a variety of names in English alone for them. In general however, unspecific words for a branch (such as rise and rame) have been replaced by the word branch itself. Specific terms[edit source] A bough can also be
called a limb or arm, and though these are arguably metaphors, both are widely accepted synonyms for bough.  A crotch is an area where a trunk splits into two or more boughs. A twig is frequently referred to as a sprig as well, especially when it has been plucked. Other words for twig
include branchlet, spray, and surcle, as well as the technical terms surculus and ramulus. Branches found under larger branches can be called underbranches. Some branches from specific trees have their own names, such as osiers and withes or withies, which come from willows. Often trees have certain words