There are many issues that can effect the quality of wood & timber. Defects usually mean that a quality piece of timber can be sold at a discounted price.
this are defects coursed to wood during seasoning
Not exacly.It only causes problems in the first 8 months.
A teratogen is an agent that causes birth defects.
A teratogen is a factor that causes birth defects.
The four causes of birth defects are body metabolism,function of structure, and heart.
born in the wrong age
Frederick O. Lemery has written: 'Dry kiln defects' -- subject(s): Drying, Wood, Defects, Lumber
Heart defects tend to run in families. So, a medical history is important. However, there are many other causes of heart defects - such as smoking, drinking, hot tubing, taking drugs/medicines during pregnancy. There are also many unknown causes of heart defects. More research is needed to discover these unknown causes.
vitamin b(folic acid)
old age, deterioration, and birth defects are the most common.
The cause of esophageal atresia, like that of most birth defects, is unknown.
Congenital heart defects are errors in the development of the heart structure.