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Vlada [557]
2 years ago
15

What do echinoid, snail, and shark tooth fossils have in common?

Biology
1 answer:
guajiro [1.7K]2 years ago
3 0

Answer: All have calcium made structures which restricts their degradation and decomposition.

Explanation:

Echinoids and snails have exoskeleton which is hard and made up of calcium carbonate which is the least degradable material even after death of the organisms and remains as traces and remains in the fossils. Also the shark tooth is made of dentin which is a hard calcified tissue which does not decompose very easily. It is denser and harder then the bones. It is surrounded  by the enamel shell. The dentin and enamel prevent the degradation and decomposition of the shark tooth for long hence, it gets available as fossil.

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6 0
3 years ago
2. The vasa recta is a specialized capillary that branches from the ___________ arteriole. The blood flow in the vasa recta runs
lorasvet [3.4K]
<h2>Vasa recta </h2>

Explanation:

The vasa recta is a specialized capillary that branches from the efferent arteriole; The blood flow in the vasa recta runs parallel, but in the opposite direction to the flow of tubular filtrate within the nephron loop

  • The vasa recta capillaries are long, hairpin-shaped blood vessels that run parallel to the loops of Henle
  • The hairpin turns slow the rate of blood flow, which helps maintain the osmotic gradient required for water reabsorption
  • Absorbed water is returned to the circulatory system via the vasa recta, which surrounds the tips of the loops of Henle
  • Because the blood flow through these capillaries is very slow, any solutes that are reabsorbed into the bloodstream have time to diffuse back into the interstitial fluid, which maintains the solute concentration gradient in the medulla; this passive process is known as counter-current exchange
3 0
3 years ago
The number of __________ is most likely to rise during an infection.
Minchanka [31]
Your number of leukocytes are most likely going to rise since these are the white blood cells that help you fight off infection, disease, and bad bacteria.
5 0
3 years ago
Read 2 more answers
An airplane flies with a constant speed of 600 km/h. how far can it travel in 4 hours?
Svet_ta [14]

Answer: 2,400 kilometers.

Explanation: If an airplane flies at a constant speed of 600 km/h, then it travels 600km in one hour. Therefore, in four hours (600km*4), it will travel 2,400.

8 0
3 years ago
4. Where is the ribosome located in the cell? What is the essential role of the ribosome
abruzzese [7]

Answer:

4. Ribosomes are tiny glanular structures that are either floating freely in cytoplasm or are bound to endoplasmic reticulum.

5. Translation.

6. Eukaryotic ribosomes are ten times larger than prokaryotic ones.

7. Not sure about this.But they are necessary for protein synthesis as they assemble amino acids into protein chains.

8. Ribosomal RNA is part of ribosome.These complex structures catalyze the assembly of amino acids into protein chains.They also bind tRNAs and various accessory molecules necessary for proteins.

9. When a ribosome is not working,it disassembles into two smaller units.

Explanation:

3 0
3 years ago
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