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3 years ago

Why were the high concentrations of DDT in the birds bodies?

Biology

1 answer:

ASHA 777 [7]3 years ago

3 0

Answer:

because chlorinated hydrocarbons accumulate in fatty tissues, when a ton of contaminated fishes is turned into 200 pounds of seabirds, most of the DDT from the numerous fishes ends up in relatively few birds. As a result, the birds have a higher level of contamination per pound than the fishes.

btw :

stay safe! :3

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Describe one way osmosis and osmotic pressure is important to medicine.

OleMash [197]

Answer:

Since the beginning of life of the first multicellular organisms, the preservation of a physiologic milieu for every cell in the organism has been a critical requirement. A particular range of osmolality of the body fluids is essential for the maintenance of cell volume. In humans the stability of electrolyte concentrations and their resulting osmolality in the body fluids is the consequence of complex interactions between cell membrane functions, hormonal control, thirst, and controlled kidney excretion of fluid and solutes. Knowledge of these mechanisms, of the biochemical principles of osmolality, and of the relevant situations occurring in disease is of importance to every physician. This comprehensive review summarizes the major facts on osmolality, its relation to electrolytes and other solutes, and its relevance in physiology and in disease states with a focus on dialysis-related considerations.

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2 years ago

In humans, Rh-positive individuals have the Rh antigen on their red blood cells, while Rh-negative individuals do not. If the Rh

bixtya [17]

Answer: 60%

Explanation:

In population genetics, the Hardy-Weinberg Principle states that the genetic composition of a population remains in equilibrium as long as no natural selection or other factors are active and no mutations occur.

The frequencies of the genotypes of an individual locus will be set to a particular equilibrium value. It also specifies that these equilibrium frequencies can be represented as a simple function of the allelic frequencies at that locus. In the simplest case, with a locus with two alleles A and a, with allele frequencies of p and q respectively, the principle predicts that the genotypic frequency for the dominant homozygous AA is p^2, that of the heterozygous Aa is 2pq and that of the recessive homozygous aa, is q^2. The allele frequency of a is represented as p and the frequency of recessive allele is q.

The three genotypes AA : Aa : aa appear in a ratio p² : 2pq : q². If we add them up, we get the unit:

p^2 + 2pq + q^2 = (p + q)^2 = 1

And p + q = 1

Rh-positive genotypes are represented as AA (homozygous dominant) or Aa (heterozygous) since the presence of a single dominant allele is sufficient to express the phenotype. While Rh-negative genotypes are represented as aa.

If 84% of the population is Rh-positive, that means that this percentage includes all those who are AA and Aa. Then 16% are aa.

F(aa)=q^2=0.16

then F(a)=q=0.4

And since p + q = 1, p + 0.4 = 1, then p is 0.6

We can also calculate the rest, then F(AA)=p^2= 0.36

So F(Aa)= 2pq = 2 x 0.6 x 0.4 = 0.48

Notice that 0.36 + 0.16 + 0.48 = 1

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2 years ago

A patient develops postthrombotic syndrome. the nurse assesses lipodermatosclerosis, which has what hallmark characteristic?

FrozenT [24]

Postthrombotic syndrome involves the formation of blood clots in the body and that is its hallmark. Some of the symptoms include leg pain and swelling. Lipodermatosclerosis involves problems with veins in the leg and is evident by changes in the lower legs.

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3 years ago

What is the Function of the Cytoplasm found in cells?

ArbitrLikvidat [17]

Answer: Suspends all of the cell organelles

Explanation: The cytoplasm is a jelly like material, in which the organelles float in.

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2 years ago

Below is a picture of a tomato plant. It is a multicellular organism with many parts that work together to keep the plant alive.

galben [10]

Answer:

1. Roots: anchor the plant in soil and absorb water and minerals

2: Stem: Holds the plant upright and bear leaves, branches and fruits.

3. Leaves: Carry out photosynthesis to make food for other plant parts.

4. Flower: serves as organ of reproduction to maintain the continuity of the species.

Explanation:

1. Roots: The cells of roots are specialized to penetrate the soil deep to anchor the plant and absorb water and minerals for nutrition of plants.

2: Stem: The cells of stem impart mechanical strength to keep the plant upright and bear leaves, branches and fruits.

3. Leaves: Cells of leaves have chlorophyll pigment to carry out photosynthesis to make food for other plant parts.

4. Flower: Some of the cells of flowers produce male and female gametes that fuse leading to seed formation. Seed germination maintains the continuity of the species.

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3 years ago

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