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3 years ago

Diatoms have cell walls composed of _____.

Biology

2 answers:

AleksAgata [21]3 years ago

8 0

Answer:

Diatoms have cell walls composed of silicon dioxide.

BlackZzzverrR [31]3 years ago

6 0

The correct answer is a - silicon dioxide.

Diatoms are single celled algae. They have a silica - based cell wall called a frustule, which gives each diatom a particular shape.

Diatoms exist as separate single cells although some may be found in groups or colonies. The ones found in colonies create very pretty forms: leaf shaped, oval , star and even like a period.

Outer shells of diatoms are quite valuable. They are used in industry in the manufacture of toothpaste to give it grit.

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The light-independent reactions of photosynthesis need

Advocard [28]

Light-independent reactions are the second stage of photosynthesis. They make sugars. Light-independent takes place in the stroma and doesn't require light. They need carbon dioxide (CO2) from the atmosphere to build the sugars. These sugars are used to build starches and cellulose in a cycle of chemical reactions.

3 0

2 years ago

Why is the earth's inner core solid?

Furkat [3]

Earth's inner core is solid because of the extreme pressures and underneath the earth.

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3 years ago

Assume that the red blood cell counts of women are normally distributed with a mean of 4.577 million cells per microliter and a

postnew [5]

Answer: C. 82.26%

Explanation:

Given : The red blood cell counts of women are normally distributed with

$\mu=4.577\text{ million cells per microliter}$

$\sigma=0.382\text{ million cells per microliter}$

Let X be the random variable that represents the red blood cell counts of randomly selected woman.

Z-score : $z=\dfrac{X-\mu}{\sigma}$

For X=4.2

$z=\dfrac{4.2-4.577}{0.382}\approx-0.99$

For X=5.4

$z=\dfrac{5.4-4.577}{0.382}\approx2.1544$

Now, the probability that the women have red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter will be :-

$P(4.2$

Hence, 82.26% of women have red blood cell counts in the normal range from 4.2 to 5.4 million cells per microliter.

4 0

3 years ago

How is the plant able to obtain each ingredient

il63 [147K]

Answer:

light enters a plant through its leaves O2 enters the plant through the stomata's or open pores

and water enters through the roots then up the stem to the tubes to leave

Explanation:

hopefully this helps

6 0

3 years ago

Artichokes, olives and almonds can only be produced in the ________ biome. mediterranean tropical savanna tropical rain forest m

Radda [10]

The 3 can only be produced in the Mediterranean biome. This biome is known to have dry and wet weather. However, the summer seasons in this biome is very dry and usually lasts longer. Hence, the vegetation is found to be drought resistant. The 3 plants mentioned are known to be naturally drought resistant, hence it is in this biome that it thrives and survives best.

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3 years ago