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3 years ago

Earth science question

Biology

2 answers:

LekaFEV [45]3 years ago

8 0

Answer:

ice block

Explanation:

because if there was a rock in the ice the rock would keep the ice cool

goldenfox [79]3 years ago

8 0

Answer:

If they were the same size in total, then ice block

Explanation:

Rock won't melt fast, unless exposed to very high temperatures, at which case, ice would still melt faster.

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The nurse is assessing a 10-month-old infant during a checkup. which developmental milestones would the nurse expect the infant

nata0808 [166]

Answer: <span>
1- Holding head erect
2- Sitting on a firm surface without support
5. Bearing majority of weight on legs

By the time the baby is ten months he should be able to support his own head, firmly sit and bear the weight of the body in their legs. Also they crawl and possibly walk using furniture as support.
</span>

3 0

3 years ago

How many fingers do you have

bagirrra123 [75]

5 fingers on both hands

3 0

4 years ago

In bryophytes haploid reproductive cells are produced by the

a_sh-v [17]

In bryophytes, haploid reproductive cells are produced by the gametophyte. <span>Gamete-producing organs are found on gametophyte plant (the dominant form) and they are called gametangia. The haploid organ that produces male gametes is antheridia, and female producing organ is called archegonia (it produces ovum).</span>

7 0

4 years ago

in the mating between individuals with the genotypes IAi HhxiiHh what percentage of offspring would be expected to gave the o bl

Alborosie

Answer:

In the mating between individuals with the genotypes IAi HhxiiHh the percentage of offspring would be expected to gave the o blood type is: 0

Explanation:

iA, iB, and i, are the three forms of human blood type genetic information in DNA specific chromosome, called alleles, containing the ABO path that determines the blood group offspring will belong to. Human beings inherits one of these ABO alleles from the biological mother and another one from the biological father, totaling two, which will shape genotype. Thr inherited present and expressed allele is called co-dominant.

The A and B genes are dominant and the O gene is recessive, as in eye or hair color, our blood type is also inherited from our parents.

A parent of blood type AB has the co-dominant IA and IB alleles. A parent of blood type O is homozygous recessive for the i allele.

The following genotypes will yield these blood types:

- iAiA or iAi - Both genotypes produce the A protein (type A).

- iBiB or iBi - Both genotypes produce the B protein (type B).

- iAiB - This genotype produces the A and B protein (type AB).

- ii - This genotype produces no protein (type O).

So, if an O gene is paired with an A gene, the blood type will be A.

The Punnett square for their offspring is shown to the right. The genotypes of their offspring could be either IAi or IBi. Their children could be in blood groups A or B, but not AB or O.

So, your blood type does not necessarily tell you exactly which alleles you have. For example, a person with blood type A could have either two iA alleles or one iA allele and one i allele. It is possible for two parents with the same blood type (A or B) to have a child with type O blood. Both parents would have to have a mixed genotype, such as one i allele together with either one iA or one iB allele.

4 0

4 years ago

Why does t. brucei infection cause the symptoms that led to the term "african sleeping sickness"? 5. how is t. brucei infection

____ [38]

Why does t. brucei infection cause the symptoms that led to the term "African sleeping sickness"?

The African Sleeping Sickness is a prevalent disease in sub-Saharan Africa. It is caused by the Trypanosoma brucei, a parasitic protozoan carried by the tsetse fly. There are two strains of the African Sleeping Sickness. the first type is caused by the t. brucei gambiense. More than 98% of the accounted cases are caused by this strain.

The other strain is the Trypanosoma brucei rhodesiense. The symptoms of this disease are as follows: extreme fatigue, fever, irritability, severe headache, muscle and joint aches, swollen lymph nodes and skin rash. The parasite invades the central nervous system once it crosses the brain barrier.

For patients infected with the t.b. rhodesiense, the progression of the symptoms is fast. The worst symptoms usually manifest after 2 weeks of getting bitten by the tsetse fly. A t.b. rhodesiense may suffer from mental deterioration. If left untreated, it can cause death within a few months.

For patients infected with the t.b. gambiense strain, the progress is slower. The symptoms are mild, and the patient may only suffer from headaches and intermitted fever. After 7 to 14 days, the patient's central nervous system may be affected. The patient may suffer from confusion, daytime sleepiness, and insomnia. Untreated patients may die within three years.

how is t. brucei infection diagnosed? what factors often make diagnosis difficult?

The screening test for the rhodiense strain is done through microscopic examination of fluid samples. The T.b. rhodiense is mostly isolated in the blood, lymph fluid or the biopsy of the skin ulcer. As for the diagnosis of the T.b. gambiense, serologic testing is preferred because it is difficult to detect the parasite in the blood. One of the main factors that affect the diagnosis of the T.b. gambiense strain is the availability of the test kits and serum antibodies for the screening procedure.

4 0

4 years ago