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3 years ago

What technological advancement was necessary before scientists could begin to observe cells?

2 answers:

8 0

The microscope. It allowed for scientists to observe the tiny parts of cells since they are not visible to the naked eye.

Radda [10]3 years ago

8 0

The correct answer is the invention of the microscope.

Cells are the finest and the smallest functional and structural unit of a living species. They comprise of cytoplasm and nucleus, which are enveloped in a membrane. The cells are not visible to the naked eye and hence a microscope was required to witness them. Robert Hooke was the first of the scientist to witness them under the microscope.

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What is sex linked inheritance

nasty-shy [4]

Sex linked inheritance is a trait that is passed through generations in which is linked directly to an individuals gender or sex. most of the time sex linked inheritance is seen in males however it can be viewed in females.

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3 years ago

Explain /Define About Epidermis In Plant According To Class 9th<br>Plz Answer It Guys

jasenka [17]

<h3 />

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<h3>⇝ <u>Epidermis</u> :</h3>

Protective tissues includes epidermis & cork. Epidermis is basically a simple permanent tissue, protective in function. It forms one-cell-thick covering over all the parts of plant.

<h3>⇝ <u>Characteristics of Epidermis</u> : </h3>

Epidermis is formed of living cells, arranged in a single layer.

In aerial parts, epidermis is covered with a waterproof and noncellular waxy covering called cuticle.

Cells form a continuous layer, but in leaves epidermis has small openings called stomata.

Each stoma is guarded by a pair of bean-shaped guard cells which govern opening & closing of stomatal aperture.

<h3>⇝ <u>Functions of Epidermis</u> :</h3>

Epidermis protects the underlying tissues from mechanical injury, chemicals & infection.

Cuticle of epidermis protects against water loss & desiccation. It checks the rate of transpiration & evaporation and prevents wilting.

Stomata in the epidermis of leaves help in gaseous exchange during respiration & photosynthesis.

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2 years ago

What do the tympanic membranes do for the frog?

slavikrds [6]

The tympanic membrane is a patch of skin behind a frog's ear that allows it to hear on land and underwater

So basically, it's like an eardrum for a frog

Hope this helps
-Maranda

3 0

3 years ago

GLUTs are integral membrane proteins that assist in the facilitated diffusion of glucose into and out of cells. What reaction in

krok68 [10]

Answer:

i dont know that one im sorry

Explanation:

3 0

2 years ago

Alan is a 47-year-old man who has no documentation of a primary series of tetanus-containing vaccine. Which of the following wou

Brrunno [24]

Answer:

Option D, Tdap today; Td in 4 weeks; Td 6 months after the second dose

Explanation:

In general, Tdap is given before Td to all those adults who have never been administered with Tdap earlier.

Also as per the publication of CDC, any individual who is of 7 years or older than this and has never been vaccinated by Td needs following schedule of medication

a) First primary dose

b) After the first primary dose the second primary dose of Td must be given in 4 weeks and

c) The third primary dose must be given after 6 to 12 months.

Hence, option D is correct

8 0

3 years ago