For women and men in the 19- to 50-year-old range, the calcium dri is _____ milligrams.

1 answer:

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The Dietary Reference Intake (DRI) is a system of nutrition recommendations from the Institute of Medicine of the National Academics. It provides reference values of nutrients in terms of Estimated Average Requirement (EAR), Recommended Dietary Allowances (RDA), Adequate Intake (AI) and the Tolerable upper limit intake levels (UL).

Calcium is an important nutrient required for healthy bones and teeth. It is required for blood clotting, releasing hormones, transmission of nerve impulse and other functions of the body. The sources of calcium include the fortified cereals, tofu, milk powder, cheese, dried whey, fish, green leafy vegetables and others. For women and men in the age ranging from 19 to 50, the calcium DRI is 1000 milligrams per day.

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Consider the evidence that explains how physical separation of two populations of a species can cause speciation. What effect do

Tom [10]

Answer:

Interruption in the genetic flow between separated groups

The emergence of new mutations in each of the groups, and their accumulation in time. Slow and gradual differentiation between populations.
Genetic divergence by natural selection and reproductive isolation
Prezigotic isolation mechanisms

Explanation:

Allopatric speciation consists of the geographic separation of a continuous genetic background that can give place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flux, as the two new groups that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

The process of allopatric speciation involves different steps that affect organisms:

The emergence of the barrier.
Interruption in the genetic interchange
The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.
Prezigotic isolation mechanisms will be favored by selection if occurs a secondary contact between the new species in formation.

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What are two concerns of genetically modifying a child?

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If vascular plants have so many advantages, why do nonvascular plants still exist on Earth today?

pochemuha

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