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Ivahew [28]
3 years ago
13

What type of dating method would help you determine which layer is oldest? Explain.

Biology
1 answer:
Evgesh-ka [11]3 years ago
4 0
The Law of Superposition.

The Law of Superposition states that each layer is younger than the one beneath it.
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Match the characteristics with the phylum. Tongue-shaped structure called radula for grasping food spongin fibers or spicules fo
svet-max [94.6K]

Answer:

  • A Tongue-shaped structure called radula for grasping food --> Mollusca
  • Fleshy lobe-like structure called parapodia --> Annelida
  • Spongin fibers or spicules for support ---> Porifera

Explanation:

Radula: This is an organ used in feeding by mollusks. It constitutes a highly developed feeding organ. The radula has is conformed of small teeth-like structures located in rows. Lateral teeth vary in shape and size. The movements of the radula during feeding are complexes acting as a scratcher on the surface to get the food.

Parapodia: These are characteristic lateral appendixes that emerge and extend from each of the body segments of invertebrates such as polychaetes. The typical parapodium is a fleshy prolongation more or less laterally comprised and is composed of a superior branch (notopodium) and an inferior branch (parapodium).  

Spicules: Sponges (Poriferous) skeleton is composed of calcium carbonate and siliceous micro-structures called spicules. Their morphology is so varied that it is used in taxonomy for identification and classification.  

There are different kinds of spicules:  

- Monoaxonic spicule: needle-shaped, straights or curves

- Tetraxonic spicules: they have four prolongations  

- Triaxonic or Hexaxonic spicules

- Poliaxonic spicules  

Two terms can be applied to any of these spicules kinds:

- Megaspicules: They are elongated and compose the main architecture of the sponge skeleton

- Microspicules: Variable in shape and size, with ancillary functions

Sponges have few predators because of the spicule structures and their high toxicity. Many of them are capable of perforating soft tissues and producing urticant substances.

6 0
2 years ago
Some bacteria live in the roots of plants like soybeans and peas. What is the role of these bacteria in the nitrogen cycle.
love history [14]

Answer:The nitrogen present in the soil is not directly used by the bacteria. It can be used only when the nitrogen is converted into usable form. These bacteria convert  atmospheric nitrogen into ammonia, then nitrite which is then converted into nitrate. This nitrate is used by the roots of the plants like soybeans and peas. This is the role of bacteria present in the roots of the plant to convert atmospheric nitrogen into usable form that can be used by plants.

Explanation:

3 0
3 years ago
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Alexus [3.1K]
Hypothesis is the answer
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3 years ago
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Need answer quick please thanks
Lady bird [3.3K]

Answer:

The genotype will be: Bb

4 0
3 years ago
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Nitrogen is changed from a free gas to a usable form by a process called
Dimas [21]

Answer:

nitrogen fixation.

Explanation:

Nitrogen fixation is the process by which the combination of molecular nitrogen oxygen or hydrogen is given to give oxides or ammonium that can be incorporated into the biosphere. Molecular nitrogen, which is the majority component of the atmosphere, is inert and not directly usable by most living beings.

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