Original source of sand was from rocks rubbing up against each other in the ocean and the current of water in the ocean bringing them to land.
Answer:
Answer is E.
Explanation:
Generally, sphincter are circular or ring - shaped muscles, surrounding the natural opening in the body. They control the movement of substances by opening and closing through expansion and contraction.
There are many sphincter in the body, examples are
* Cardiac sphincter...found at the upper area or portion of the stomach.
* Pupilary sphincter..found in the iris of the eye.
* Glisson's sphincter...controlling the secretion of the gall bladder,pancrease and the liver.
Answer: Although both are X-linked recessive conditions, and therefore more likely in males, with the single X-chromosome. The recessive allele in colour blindness occurs at a higher frequency in the population and is a mild condition. Thus colour blindness does occur to a lesser extent in females because it needs the double recessive condition. DMD is a severe, disabling condition with a limited lifespan, and recessive allele frequency much lower, so the double recessive condition in females is very rare.
Explanation: DMD is an X-linked recessive, “nearly always in males” suggest that it also occurs due to a new mutation or some rare condition e.g. double recessive from an affected father and carrier mother, or inactivation of the normal gene in a heterozygote. It is also found that the defective allele is not completely recessive and that female carriers may exhibit mild to moderate effects.
colour blindness is polygenic, although the genes are all X-linked. It is more common in males than females. Females can carry two recessive alleles and so express the phenotype, but this is uncommon because the frequency of the recessive gene is low.
There are similarities in that both are X-linked recessives, therefore commonly expressed in males, who only have one X chromosome. The gene frequency of the colour blindness recessive is much higher than that of DMD, so the double recessive condition, which affects females, is more likely to be seen with colour blindness. In addition, DMD is a severe condition associated with disability and limited lifespan, which reduces the probability of mating between an affected male and carrier female
Answer:
Explanation: Loss of habitat (destruction) and loss of genetic variation. Another reason could include hunting.
TRANSPORT IN PLANTS?
What about transport in plants, how does
a Redwood, one of the tallest trees in the world, move water from the
soil to the needles on its tallest branches over 300 ft in the air?
(That’s over 30 stories high!) Or how does a carrot transport the
sugars made in its green, leafy tops below the surface of the soil to
grow a sweet, orange taproot? Well, certain types of plants (vascular plants)
have a system for transporting water, minerals, and nutrients (food!)
throughout their bodies; it’s called the vascular system. Think of it as
the plant’s plumbing, which is made up of cells that are stacked on top
of one another to form long tubes from the tip of the root to the top
of the plant. To learn more about it, let’s study the stem.
