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lilavasa [31]
3 years ago
14

What is a sharks' skin made of?

Biology
1 answer:
FinnZ [79.3K]3 years ago
3 0
Shark skin is made of a matrix of tiny, hard, tooth-like structures called dermal denticles or placoid scales. These structures are shaped like curved, grooved teeth and make the skin a very tough armor with a texture like sandpaper.
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Match the following types of nervous systems with their functions.
Cloud [144]

The following are the types of nervous system and their functions.

1. Parasympathetic- functions as the relaxing response.

2. Sympathetic - functions as the flight and fight response.

3. Autonomic - it functions as the controller of automatic response.

4. Somatic- functions as controling voluntary response.

5. Peripheral- works as motor nerves and sensory which runs from and to central nervous system.

6. Central- works as the main interpretation and center of processing.

4 0
3 years ago
Read 2 more answers
The diagram below shows the carbon cycle. The light blue arrows represent the flow of carbon.
LenaWriter [7]

Answer:

photosynthesis and the erosion of limestone

8 0
3 years ago
Que tipo de aislamiento reproductivo exhibe la mula?
bulgar [2K]

Answer:

<em>Aislamiento postreproductivo: Esterilidad del híbrido</em>

Explanation:

El concepto biológico de <u>especie</u>, en su definición, destaca que los ejemplares de una especie no pueden entrecruzarse con ejemplares de otra especie distinta, o bien, en caso de hacerlo, no hay éxito reproductivo.

Existen distintos mecanismos de aislamiento reproductivo, que son barreras que inhiben o interrumpen el flujo génico entre especies distintas. Se trata de caracteres biológicos propios de cada especie que previenen la reproducción con otras especies.

Estos mecanismos de aislamiento reproductivo pueden ser precigóticos o postcigóticos.  

  1. Pre-copulatorios o pre-cigóticos:
  • Ecológico o por aislamiento de hábitat;
  • Estacional o temporal;
  • Sexual o etológico;
  • Mecánico;
  • Por incompatibilidad de gametas.  

   2. Post-copulatorios o cigóticos:

  • Inviabilidad del híbrido;
  • Esterilidad del híbrido;
  • Híbrido con viabilidad o fertilidad disminuido;
  • Interacciones citoplasmáticas.

La mula es producto de la cruza entre dos especies distintas: una yegua (<em>Equus ferus caballus</em>) y un burro (<em>Equus africanus asinus</em>). Es un ejemplo de la accion de mecanismo poscigótico, en el cual se forma un híbrido viable esteril. Este ejemplar puede nacer crecer y sobrevivir, pero que no pueden producir gametas funcionales, por lo cual no pueden reproducirse.        

4 0
3 years ago
The Neanderthal copy of a gene crucial for language (FOXP2) more closely resembles the same gene in chimpanzees than in humans,
liraira [26]

Answer:

b. False

Explanation:

FOXP2 gene is required for language and speech development and is present in all animals. It is a transcription factor which encodes for a regulatory protein. Both modern humans and Neanderthals share FOXP2 gene which differs from chimpanzee version by two amino acids. Its the different regulation of the same gene which made modern humans more capable of  using language and speech. Neanderthals did use language rudiments but not completely constructed languages. There might be other speech genes involved too which differed between modern day humans and Neanderthals but not FOXP2.

3 0
3 years ago
Identical twins who have separate placentas are somewhat less similar than identical twins who share a placenta. This best illus
Jobisdone [24]

Answer:

prenatal environments

Explanation:

Depending on the number of fertilized eggs and when the zygote division occurs, there are different types of twins. For example, If the zygote is formed by the union of an ovule and a sperm that after fertilization is divided to create two embryos, they are born identical twins, these babies carry the same genetic information.

4 0
3 years ago
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