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3 years ago

What conditions are avoidable and unavoidable in plant experiments?

Biology

1 answer:

galina1969 [7]3 years ago

3 0

The conditions that are considered to be avoidable and unavoidable in plant experiments are the following;

Avoidable – bias, plotting or graphing errors, calculating, enough sample for representation, having no control group

Unavoidable – species variations or kind of specie used, nature or environment, genetics

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What is the purpose of the pericardial sac that surrounds the heart in mammals

Nitella [24]

Answer:

Pericardial sac has protective tole

Explanation:

Pericardial sac or pericardium is a fibrous tissue that surrounds the heart. It has two coats:

the outter coat-parietal pericardium
the inner coat-visceral pericardium or epicardium which is double-layered and contains pericardial fluid between those two layers (pericardial fluid is necessary as a lubricant for the heart movement).

Besides lubrication, percardium also protects heart from infections, fixes it and limits its movements.

6 0

3 years ago

Why does DNA change from one generation of species to the next? Explain the two reasons. (be sure to include the concept of RAND

pogonyaev

Answer:

RANDOM SPECIES

Explanation:

We're no strangers to love

You know the rules and so do I

A full commitment's what I'm thinking of

You wouldn't get this from any other guy

I just wanna tell you how I'm feeling

Gotta make you understand

Never gonna give you up

Never gonna let you down

Never gonna run around and desert you

Never gonna make you cry

Never gonna say goodbye

Never gonna tell a lie and hurt you

We've known each other for so long

Your heart's been aching but you're too shy to say it

Inside we both know what's been going on

We know the game and we're gonna play it

And if you ask me how I'm feeling

Don't tell me you're too blind to see

Never gonna give you up

Never gonna let you down

Never gonna run around and desert you

Never gonna make you cry

Never gonna say goodbye

Never gonna tell a lie and hurt you

No, I'm never gonna give you up

No, I'm never gonna let you down

No, I'll never run around and hurt you

Never, ever desert you

We've known each other for so long

Your heart's been aching but

Never gonna give you up

Never gonna let you down

Never gonna run around and desert you

Never gonna make you cry

Never gonna say goodbye

Never gonna tell a lie and hurt you

No, I'm never gonna give you up

No, I'm never gonna let you down

No, I'll never run around and hurt you

I'll never, ever desert you

6 0

2 years ago

Planarians lack dedicated respiratory and circulatory systems. This deficiency does not cause a problem because ________.

ZanzabumX [31]

Answer:

Most cells within planarians tend to be very close to their gastrovascular cavity, in addition to their external environments. Also, planarians have the ability for oxygen and carbon dioxide to diffuse through the cells on their body walls: this makes it unnecessary for these varieties of flatworms to need a dedicated bodily system.

I think the deficiency of dedicated respiratory and circulatory systems in Planarians does not cause a problem because none of their cells are far removed from the gastrovascular cavity or from the external environment. Planarians are free-living flatworms and form the class Turbellarians in the Phylum Platyhelminthes. Flatworms have three tissue layers, that is the ectoderm, mesoderm, and endoderm.

hope this helps!!!!!....

Explanation:

6 0

3 years ago

What is the difference between mitosis, and meiosis?

nataly862011 [7]

Answer:

Mitosis involves the division of body cells, while meiosis involves the division of sex cells. ... Two daughter cells are produced after mitosis and cytoplasmic division, while four daughter cells are produced after meiosis. Daughter cells resulting from mitosis are diploid, while those resulting from meiosis are haploid

8 0

3 years ago

The client was diagnosed with cocaine abuse at age 30. When the client was 23, the client was diagnosed with major depressive ep

allochka39001 [22]

Answer:

d-The client most likely has a dual diagnosis since she has both a substance dependence and depression.

Explanation:

What is dual diagnosis?

An individual with dual diagnosis shows both a mental disorder and an alcohol or drug situation. These situations is seen in unison more often. Nearly half of people who shows a mental disorder do express substance use disorder at a point or the other. The interrelationship of the two situation can worsen both.

Why do substance use disorders and mental disorders is often seen in unison?

Thou they occur together, but it can't be said that one prompt the other, even if one started earlier as in our case study.

There are three reasons showing why they occur in unison:

•Generally, risk factors may lead to both mental disorders and substance use disorders. Such as genetics, stress, and trauma.

•Mental disorders can lead to drug use and substance use disorders. Using drugs or alcohol to find relief (self-medication). This could lead to addiction.

•Substance use and addiction can contribute to the occurrence of a mental disorder. Causes brain changes.

What are the treatments for dual diagnosis?

Individuals with dual disorder should treat both conditions. For the treatment to be operative, there is need to abstain from alcohol or drugs. Treatments may involve behavioral therapies and medicines. Also, support groups importance for emotional and social support cannot be neglected.

6 0

3 years ago