Although a fetus is relatively protected in its mother's womb, a number of different toxins can harm the fetus. These include lead, mercury, glycol ethers, and many other substances. How do toxins usually reach the developing fetus

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Answer 1

Answer:

Answer:

Although the blood of the fetus and the mother does not mix, Simple diffusion across the membrane of the placenta occurs.And since diffusion is the movement of ions and gaseous molecules across the membrane from the higher concentration of the mother blood to the lower concentration of the fetus, toxic chemical are conveyed across.,

Explanation:

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Which explains why North Africa has a hot, dry climate, while India has a tropical climate when they are located at the same latitude?
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What is Grave's disease?

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Answer:

Graves´ disease is an autoinmmune disease that is caused when the immune system attacks the cells of the thyroid gland, which leads to an overproduction of the hormones secreted by the thyroid gland. This constant attack and destruction on the part of the immune cells causes the thyroid to increase in size, a condition that is commonly known as hyperthyroidism.

Hyperthyroidism can become a really serious issue because the excessive production of the hormones of the thyroid gland will increase the metabolic activity of all parts of the body and can, if left untreated, cause such serious conditions as blood clotting problems, type 1 diabetes, among others.

The gene for hemophilia in humans is present on the X chromosome only. Which inheritance pattern does hemophilia in humans represent?Homozygous
Multiple alleles
Polygenic
Sex linked

i think its sex linked but im not sure.

Answers

If it is an X-Linked trait, the answer would have to be "Sex-Linked". If it is on the X chromosome, it is on a sex chromosome.

Answer:

Yes, D is correct.

Explanation:

Crossing over would most likely occur during which stage of the cell cycle?when DNA is being replicated

when homologous chromosomes line up in pairs

when centromeres are separated

when cytokinesis begins

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Answer:

When homologous chromosomes line up in pairs.

Write ten ways by which water bodies are polluted

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Answer:

A few ways could be

-toxic waste

-trash and plastic

-sewage

-indirect contamination

-bacteria and parasites

-mining

-burning fossil fuels

-direct marine dumping

-oil leak

-chemical pesticides

Explanation:

These are the 10 I found and came up with but there are many detrimental ways that we directly and indirectly effect the pollution of water.

In a large population, the allele frequency of A was .5 and changed to .7 over just a few generations. Which of the following statements about this example is FALSE?1. Evolution is occurring in the population.
2. The A allele is undergoing positive selection and istherefore adaptive.
3. The a allele is undergoing negative selection anddecreases fitness.
4. The population is undergoing genetic drift.
5. None of the above is false

Answers

Answer:

Option:(5)- All of them are correct.

As the change in allele frequency causes the change in genome of the living organism inside few generations.

Explanation:

The effects of change in allele frequency:

The effect may leave the organism with the loss of some genes, while it can effect cause the loss of some of the beneficial genes inside the genome of the organism. Along with that the process can also improve the sequence of genes which are abnormal in nature.

Genetic Drift:

"The change or the evolution inside the alleles frequency of the organisms genome, which may occur due to the chance events."

As the process of genetic drift occurs inside generations, which leaves the random organisms to live.

This example of sedimentary rock is formed when rock fragments, minerals, and the remains of plants and animals are deposited as sediments and are thenA) chemically weathered by water.
B) compacted and cemented together.
C) recrystalized under the weight of the layers.
D) melted due to increased temperature and pressure.

Answers

B) compacted and cemented together

Answer: B) compacted and cemented together

Explanation:

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Newly-formed root cells begin to form different cell types in the ________.zone of elongationzone of maturationroot meristemzone of cell division

Use the Punnett square above and the text to help you determine which statements are true.

The evolution of new organs usually builds on preexisting structures that are modified in form and sometimes function. The embryos of fish, amphibians, reptiles, birds, and mammals all have pharyngeal pouches or gill slits. These pouches develop into gills in adult fish and they are used to absorb oxygen from their watery environment. These same pouches become parts of the in_________ humans. a) eyes and lungs b) ear and throat c) eyes and nose d) lungs and heart