The A horizon is the best for plant growth, because is has more organic material and more organisms that make the soil more fertile than the deeper layers, and the soil is not loose like the O horizon.
the A horizon
Answer: Ventajas: Los antibióticos han ayudado a controlar diferentes enfermedades, por ejemplo: la tuberculosis, la lepra, la escarlatina, el Sífilis, etc. Gracias a estos muchas personas han sido salvadas. Otras de las ventajas es que los antibióticos pueden tratar ciertas infecciones con total eficacia. Desventajas: Una de las desventajas de los antibióticos es la resistencia que generan estos ante las bacterias, esto se da por selección natural a través de mutaciones producidas por azar, pero presión selectiva a una población. Si los antibióticos están mal empleados, los antibióticos pueden generar mucho más daño.
Answer:
By performing a test cross i.e. a cross with a recessive trait
Explanation:
According to the question, hairlessness is a recessive trait, meaning that it will only be expressed in a homozygous condition i.e. when there are two recessive alleles in the genotype. Presence of hair is dominant, meaning that it will mask the phenotypic expression of hairlessness allele in a heterozygous state. Hence, a dominant phenotype can either be homozygous (same dominant allele) or heterozygous (combination of dominant and recessive alleles).
In order to determine which of these genotypes the dominant phenotype possess, we perform a test cross. A test cross is a cross performed to determine the genotype of the dominant organism by crossing it with a homozygous recessive genotype.
Ideally, the offsprings resulting from the cross will all be phenotypically dominant if the organism in question is homozygous dominant but if the organism is heterozygous dominant, the offsprings will occur in an equal ratio of dominant to recessive phenotypes.
So in this case, all of offsprings of this cross between the rat terriers will possess hair if the dominant rat terrier dog is homozygous, but if the dominant rat terrier dog is heterozygous, an hairless offspring will be produced.
Answer:
A. Surprising.
Explanation:
The above scenario is completely surprising because there are 10 planets in solar system and considering all the orbit approximately in the same plane. But amazingly half (five) of the planets orbit counterclockwise, while remaining five planets orbit clockwise (opposite direction).
Reasonably, all planet should be orbit in same direction but it's surprising that in a same solar system half are orbit clockwise and half are anticlockwise.
A theory is a set of sentences which is closed to make logical implications.
