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Viktor [21]
3 years ago
11

Please . help. thank you .

Biology
1 answer:
Licemer1 [7]3 years ago
6 0

Answer:

The oldest rock layer is letter E and the youngest is letter A

Explanation:

Soil piles on top of each other as time goes on via weather

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Which of these are stimuli that earthworms respond to? Check all that apply.
Kisachek [45]

They respond to all of these except color

hope dis helps ^-^

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What process adds carbon dioxide to the air
qwelly [4]

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respiration

Explanation:

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2 years ago
Which culturing method proivded the clearest results, the semisolid medium tube or the soft agar plate?
sattari [20]
The answer to this question would be soft agar plate.

The semisolid medium tube is mostly used for containing the specimen. It is hard to examine semisolid medium since the bacteria can grow in the upper part, middle part or even the lower part of the medium. In agar plate, the bacteria always growth in the upper part so it is easier to count the bacteria.
But semisolid can give some more information in determining whether the bacteria is anaerobic by looking for bubble inside the medium. Anaerobic bacteria can do fermentation that will produce air.
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3 years ago
Which of the following is an example of a negative feedback loop? Select one: a. Uterine contractions to expel a fetus during la
PtichkaEL [24]

Answer:

d

Explanation:

<em>The correct answer would be increasing heart rate to compensate for low cardiac output.</em>

The negative feedback loop is the mechanism that is utilized in the maintenance of homeostasis. They work by opposing the processes that bring about a deviation away from setpoints, that is, the normal range of operation of physiological processes in the body.

<u>For example, when the heart rate goes below the setpoint, the negative feedback loop swings into action through the sensor, the control center, and the effector to return the heart rate to the normal operating range.</u>

Correct option: d

6 0
3 years ago
A protein is 300 amino acids long. Which of the following could be the number of nucleotides in a bacterial gene that codes for
butalik [34]

Answer:

2) 100

Explanation:

  • Every 3 nucleotides in an mRNA specifies the addition of one amino acid in a protein.
  • Each three-letter "word" which is the combination of nucleotides is called a codon.
  • Therefore, amino acids are coded by a series of three-letter "words" - a 300 nucleotide mRNA will code for a 100 amino acid protein.
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3 years ago
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