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marta [7]
3 years ago
12

Which animal undergoes external fertilization?

Biology
1 answer:
zhannawk [14.2K]3 years ago
7 0

Answer:

Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce.

= Fish

Explanation:

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omeli [17]

The Spanish Civil War is also known as The Crusade (Spanish: La Cruzada)

Soviet Union and Mexico supported the Cold War.

Countries like the Soviet Union and Mexico supported the Allies,

while countries like Germany and Italy supported Nazism.

<h3>Who were the Allies of the Nazis?</h3>

The Axis countries (Germany, Italy and Japan) and the Allies (France, England, USA and, later, USSR) constituted the alliances formed in the Second War. World War II was a conflict of global proportions that took place between 1939 and 1945.

With this information, we can conclude that the Spanish Civil War resulted from a confrontation between fascist and communist nationalist forces, which began to vie for power in the country.

Learn more about World War II in brainly.com/question/1449762

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2 years ago
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OverLord2011 [107]
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A nurse admits a neonate with a maternal history of drug abuse to the nursery. the neonate's vital signs are axillary temperatur
lisabon 2012 [21]
The nurse should check the neonate's blood glucose level. It is also Instruct the family to keep the infant in the mother's room until culture results are available. Warm the neonate gradually or Place the infant under a warmer and notify the registered nurse.
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3 0
3 years ago
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You determine that you have only three copies left of an important DNA fragment, so you decide to amplify it. Using flanking pri
kicyunya [14]

Hello. This question is incomplete. The full question is:

"You determine that you have only 3 copies left of an important DNA fragment, so you decide to amplify it. Using flanking primers, how many PCR cycles would you have to run to generate over one billion (10^9) copies of the fragment? "

Answer:

Approximately 29 cycles of PCR would be required.

Explanation:

As you may already know, PCR is a technique used in molecular biology that allows part of a DNA molecule to be recycled into millions of copies.

PCR allows this replication to be done through cycles. Each PCR cycle lasts about 2 minutes and allows the DNA molecule to undergo the separation of the strands, the binding of the primers and the synthesis of new DNA strands through DNA polymerase. This cycle is usually repeated 32 times, but this number may change depending on the number of copies the researcher thinks is necessary.

In this case, if a researcher wants 10 ^ 9 copies of DNA, he must do the following calculation to find the number of PCR cycles needed:

32 ^ x = 10 ^ 9

x = 28.3 = approximately 29 cycles.

4 0
4 years ago
What 2 chemicals are inside skeletal muscle?
marta [7]

Answer:

Skeletal muscle tissue is composed of cells called muscle fibers. When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber.

8 0
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