BIOLOGY MIDDLE SCHOOL

A. Colorful, marine worm whose body is flattened dorso-ventrally. Swimsthrough the water using a wavelike motion.
PHYLUM?​

Answers

Answer 1
Answer:

Answer:

Phylum platyhelminthe

Explanation:

Although a few of the free living marine and terrestrial species are very beautiful, most species are not particularly attractive to the human mind. Their body is dorso-ventrally flattened.They exhibit bilateral symmetry.   They do not have a body cavity and are acoelomate.  The movement of most platyhelminthes is using a wavelike motion that is controlled by longitudinal, circular, and oblique layers of muscle as they contract and relax simultaneously.

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What signals that a pine tree is capable of reproduction?

Answers

The presence of cones in the tree signals its readiness for reproduction, as the cone contains the seeds! c:
Little sprout that are near the tree and sal in certain areas

How might an object feel that absorbs light?

Answers

An object that absorbs light would be much hotter upon touch. It might also expand by a few milimeters depending on what material it's made of.

Answer:

An object might feel warm.

Explanation:

Sometimes light contains heat, and the more light it absorbs the warmer it gets.

Devise a serial dilution scheme to prepare 1/20, 1/40, and 1/80 dilutions of a disinfectant

Answers

Answer:

The serial dilution can be done by half- logarithmic dilution method.

Explanation:

  • This is also called the Ten-fold dilution method.
  • The process involves the following steps, and the volumes represented are arbitrary.
  1. From the concentrated solution of the disinfectant take 1 ml of disinfectant in a falcon tube. 9 ml of water is added to that. Here we get a solution which is  (1)/(10) diluted.
  2. Take 1 ml of the above (1)/(10) diluted solution in another falcon and add 9 ml of water to it. Here we will get a solution which is  (1)/(20) diluted.
  3. Take 1 ml of the above (1)/(20) diluted solution in another falcon and add 9 ml of water to it. Here we will get a solution which is  (1)/(40) diluted.
  4. Take 1 ml of the above (1)/(40) diluted solution in another falcon and add 9 ml of water to it. Here we will get a solution which is  (1)/(80) diluted.

Final answer:

To prepare a serial dilution, you start with the stock solution and dilute it step-by-step. For a 1/20 dilution, take 1 part solution and add 19 parts solvent. For a 1/40 dilution, dilute the 1/20 solution further by taking 1 part of the 1/20 dilution and adding 1 part solvent. Similarly, for a 1/80 dilution, take 1 part of the 1/40 dilution and add 1 part solvent.

Explanation:

To prepare a serial dilution, you start out with a stock solution (in this case, the disinfectant) and dilute it step by step. To prepare the 1/20 dilution, you take 1 part stock solution and add 19 parts solvent. Then for a 1/40 dilution, you can dilute the 1/20 solution by a further factor of 2: take 1 part of the 1/20 dilution and add 1 part solvent. The same principle applies for the 1/80 dilution: take 1 part of the 1/40 dilution and add 1 part solvent, or you could take 1 part of the original stock solution to 79 parts of solvent.

Learn more about Serial Dilution here:

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Diego is studying compost. He conducted an experiment to see how moisture levels affect the breakdown of organic materials in compost piles. Diego found that adding 1 L of water per 10 kg of dry matter caused the compost to break down at the fastest rate, but adding more than 1 L caused decomposition to slow down. Which of the following questions do these results lead to? I. Why does adding more than 1 L of water per 10 kg cause decomposition to slow down? II. Does this ratio of water to dry matter hold true for all organic materials being composted? III. Why should anybody want to start a compost pile? A. I, II, and III B. I only C. I and II only D. II and III only

Answers

Answer:

Option C , I and II only

Explanation:

The study conducted is done only for people or organisations that either started a compost pile or who want to start a compost pile. Thus result III is not at all a valid question for the study conducted.

However, there can be question related to the result of experiments clarifying  the quantity of additives used in the experiment for  example why only 10 Kg of dry water, why not to add more than 1 L of water , why only water is to be added why not some other solvent etc. Thus question I is a valid question.

Also , question II is valid as it asks about expanding the scope of experiment from one type of organic material to all other type of organic matter in the compost.

There fore both question I and II are valid question and thus option C , is correct.

Sort the mutations based on whether their effects are harmful, beneficial, or neutral to the organisms that experience them.a mutation in a noncoding
region of DNA
a mutation that
Ancierses the ability
to store moisture
ina y environment
a color mutation
that decreases a
bird's chances
of sexual selection
a mutation in a gene
that does not change
protein synthesis
increased white
pigmentation on
a prey animal in a
Snowy environment
a mutation decreasing
a plant's height in
competition for light
Harmful
Beneficial
Netural

Answers

Answer:

first option  nuetral

second option is benificial only if it required mositure

third harmful decreasing the sexual trait will effect the survial rate and it all depending how on way it can reproduce

icreasing white sprot is benifical

Explanation:

Huge tunnels called burrows carry water into the dam to the fan-like turbines.True

False

Answers

True true true true true true maybe
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