Waste solvents are flammable but not toxic true or false

1 answer:

6 0

The statement above is FALSE.
Waste solvents are both flammable and toxic.
Waste solvents refers to the liquid waste obtained from the chemical processes that are performed in a laboratory. Such waste are labelled as hazardous, which means, they are toxic and harmful.

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A population of white moths lives in a forest near a factory. this factory burns coal and pollutes the air with black dust. over

marissa [1.9K]

The answer to your question is option b

This is because if the trees are black, and covered with soot due to the pollution, caused by industrialisation, the white moths will be easily seen and constantly hunted by the predator, compared with the black moth population as they camouflage easily. Ultimately, the white moths would be hunted to such an extent that their population would dramatically decrease

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3 years ago

Which of these statements best describes a difference between the two layers?

madam [21]

Hi!

Could you please be more specific, so that I can answer your question properly? Layer of what?

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Thousands of years ago, giraffes with short necks were common within giraffe populations. Nearly all giraffe populations today h

LiRa [457]

Full question:

Thousands of years ago, giraffes with short necks were common within giraffe populations. Nearly all giraffe populations today have long necks. This difference could be due to

giraffes stretching their necks to keep their heads out of reach of predators

giraffes stretching their necks so they could reach food higher in the trees

a mutation in genetic material controlling neck size occurring in some skin cells of a giraffe

a mutation in genetic material controlling neck size occurring in the reproductive cells of a giraffe

Answer:

This difference could be due to:a mutation in genetic material controlling neck size occurring in the reproductive cells of a giraffe

Explanation:

The primary short-necked forms contained large, mutable populations. Following the selection pressure of desiccations and leaf deficiencies, those changes with longer necks and forelegs sustained and repeated preferentially. In this procedure, throughout generations, these large mammals have occurred, being acclimated to their unique environment .

Lamarckian theory illustrated giraffe neck metamorphosis by showing that consistent stretching gradually extended their necks, and that they then moved on these propitious longer necks to their offspring. Environment and other variations created the extirpation of the eurasian giraffids, but various African species endured.

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Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Down syndrome is a geneti

emmainna [20.7K]

The correct answer for the question that is being presented above is this one: "B. extra chromosome 21." Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Down syndrome is a genetic disorder that is also called trisomy 21. Trisomy 21 look like in a karyotype with extra chromosome 21

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3 years ago

Read 2 more answers

Under which conditions do most types of cells function at optimal levels

Scrat [10]

Explanation:

Cells maintain a constant internal environment; this process called homeostasis, ensures that cells obtain an optimal environment in which they can best function.

The endocrine system involves chemical signalling via the secretion of molecules called hormones into extracellular fluid. They bind to chemical receptors in order to cause specific changes in target cells, these lead to changes in the body's internal environment called homeostasis.

It includes the thyroid, parathyroid, pituitary, pineal and adrenal glands along with other regions. The bone, adipose tissue, heart, pancreas and liver are a few of the regions of the body which show endocrine function. The brain, or control center functions to receive and process the information from the receptor. Effectors receive the control center's command and illicits a response in the form of a feedback loop, that may oppose or enhance the stimulus.

Further Explanation:

During homeostasis the body maintains a constant internal balance in pH, temperature, blood pressure etc. Cells in a multicellular organism become specialized for particular tasks and communicate with one another in order to maintain homeostasis. Within the human body these are known as hormone cascades, where several complex steps occur- the tissues signal to one another with the use of hormones released by the endocrine system. The regulation (increase and decrease) of these secretions is achieved by negative feedback loops, where the release of certain substances during a cascade in turn halts the secretion of hormones at earlier stages.

For example, cells within the human body function at an optimal temperature between 97°F (36.1°C) and 99°F (37.2°C). This is due to the optimal temperature requirement of the enzymes within the human body, which requires this specific range to obtain activation energy.