BIOLOGY HIGH SCHOOL

What is another term for a texture where some crystals are visible to the unaided eye while others are not?A. aphanitic
B. phaneritic
C. pegmatitic
D. porphyritic

Answers

Answer 1
Answer: D. porphyriticThe word porphyritic is a descriptive adjective that describes certain textures of rock under igneous category. This type of texture can either be aphanetic (with fine crystals that cannot be seen by an unaided eye) and phaneritic with large enough crystals visible.

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How does environmental change affect the survival of a species?
What is true for an amoeba, a clock, or both.
Identify the type of mutation shown in the diagram, with respect to chromosome 20.
20 POINTS!!! Help!!! Conditions under which natural selection occurs in a population of tortoises are described in the table below: Natural Selection Description Condition Description A The population comprises smaller adult tortoises and larger adult tortoise B Food is scarce on the island where the population is present Which factor contributes to natural selection for each condition? Condition A and Condition B represent competition. Condition A and Condition B represent inherited variation. Condition A represents competition, and Condition B represents inherited variation. Condition A represents inherited variation, and Condition B represents competition.
Guppies are small, tropical freshwater fish that display wide variation in coloration. Some have bright splotches of blue, red, and orange, while others are quite drab and dull. Research has shown that females prefer to mate with brightly colored males; however, this trait makes them more likely to be seen. Guppies, like all species, must be able to both survive and reproduce in order to avoid extinction What is one factor that can affect what color trait is selected for a particular environment?

Which of the following statements about agricultural societies is true? a. Agricultural societies did not pollute the environment. b. Agricultural societies impacted the environment less than hunter-gatherer societies. c. Agricultural societies had a higher population than hunter-gatherer societies. d. Agricultural societies impacted the environment more than industrial societies.

Answers

The one that is true about agricultural societies is : C. Agricultural societies had a higher population than hunter-gatherer societies

Hunter gatherer societies haven't learn to produce their own food, so they tend to keep moving in a significantly smaller group than the agricultural society to get enough foods for their groups

hope this helps

The genetic material appearing like a thread in the nucleus is known as _____. chromatin DNA the spindle

Answers

The correct answer is the chromatin. The chromosomes of all organisms, excluding bacteria, are made of chromatin. Chromatin is a group of macromolecules consisting of RNA, DNA, and protein.

The correct answer is the chromatin.

What’s the definition of polyunsaturated fats

Answers

Answer:

Polyunsaturated fat is a type of dietary fat.It is one of the healthy fats,along with monousaturate fat. Polyunsaturated fat is found in plant and animal foods such as salmon,vegetable oils,and some nuts and seeds
Polyunsaturated fats are a type of healthy fat that includes omega-3 and omega-6 fatty acids, which are essential for brain function. You must obtain them from food, as your body cannot make them.


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Many drugs can be applied to the skin without entering the blood. How is this fact explained by the structure of the skin

Answers

The skin is made of epidermis and dermis layer. The blood vessel can be found in the dermis layer, a layer below the epidermis. To reach the blood, the drug has to pass through the epidermis. 
Epidermis is a layer that made of keratinized squamous epithelial cell that located in the outer layer. The epidermis layer is strong and prevents movement of water, which makes them hard to be penetrated by drugs. If the drug doesn't have a good penetration, it will not reach the dermis, thus not reaching the blood vessel. 

Medicines which are applied on skin they penetrate into the skin through hair follicles or epidermis and then into the circulation.

Further explanation

Skin

It can be defined as the largest skin organ with an all-out territory of around 20 square feet. The skin shields us from microorganisms and the components, manages body temperature, and grants the vibes of touch, warmth, and cold.

Layers of skin

It comprises three layers which are following.

Epidermis

It is the first layer of skin and it is a waterproof obstruction that gives skin its tone. Dead cells are shed consistently from the epidermis as new ones have their spot. Every day 500% million skin cells are shed by us. Indeed, the furthest pieces of the epidermis comprise of 25–30 layers of dead cells.

Layers of epidermis

  1. stratum corneum
  2. stratum lucidum
  3. stratum granulosum
  4. stratum spinosum
  5. stratum germinativum

Dermis

It makes sweat and oil, gives sensations and blood to the skin, develops hair. It is connective tissue, and it shields the body from anxiety It gives the skin quality and versatility. On the off chance that the dermis is extended a great deal, for example, during pregnancy, the dermis can be torn, and this appears as supposed stretch imprints.

It comprises two layers

  1. Papillary region
  2. Reticular region

Subcutaneous tissue

It joins dermis to the body, controls body temperature, stores fat. The most profound layer is called subcutaneous tissue, the hypodermis. It isn't actually part of the skin however appends the skin to hidden bone and muscle. Subcutaneous tissue likewise gives skin nerves and blood supply.

Absorption through skin

Drugs penetrate from the external surface of the skin both into the skin. Skin assimilation identifies with the level of introduction to and conceivable impact of a substance which may enter the body through the skin. Human skin comes into contact with numerous operators deliberately and accidentally. Skin assimilation can happen from word related, ecological, or shopper skin introduction to synthetic concoctions, beautifying agents, or pharmaceutical items.

Answer details

Subject: Biology

Level: High school

Key words

  • Skin
  • Layers of skin
  • Epidermis
  • Layers of epidermis
  • Dermis
  • Subcutaneous tissue
  • Absorption through skin

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A homozygous tall (dominant) pea plant is crossed with a short (recessive) plant. The probability that an F1 plant will be tall isA. 100%.

B. 50%.

C. 75%.

D. 25%.

Answers

The answer is A. 100%

A 100% is the correct answer

Which statement is true concerning light?Frequency and wavelength mean the same thing
As frequency goes up, wavelength does down
Light has frequency but no wavelength
Light has wavelength but no frequency

Answers

Freq. and wavelength are NOT the same.When one goes up, the other goes down -thats TRUELight does behave like a wave so it has both freq and wavelength
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