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iVinArrow [24]
3 years ago
5

What is the advantage and disadvantage of animals that have placenta with those do not have placenta.​

Biology
1 answer:
Mariana [72]3 years ago
4 0

the advantage of the placenta is that pregnant animals hardly notice the presence of small embryos during the early stages.

in animals without a placenta all necessary nutrients should be present in the egg prior to fertilization.

hope i could help and good luck!

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Why are proteins considered organic molecules?
snow_lady [41]

Answer:

A) They contain many carbon atoms.

Explanation:

Proteins are considered organic molecules because they are made up of carbon atoms. Proteins give your body energy and allows your body to run the way it does. Proteins also aren't considered organic molecules because they are small, because they are not used by living things, or because they contain nitrogen.

Hope this helps.

-lvr

8 0
3 years ago
Match the reproductive structures based on their function and the system to which they belong.
Rashid [163]

Complete question: Find the complete question in the attached file below.

Answer: From the question, the system to which the structures belong are:

Female reproductive structures include: Egg, ovary, fallopian tube, vagina.

Male reproductive structures include: Urethra, sperm, testis, Vas deferens

Explanation:

The female reproductive system is made up of structures, listed above, which functions together with the purpose of reproducing offsprings. Below is the structure matched with the correct function from the question given:

--> Egg: This functions as the sex cell or gamete

--> ovary: The site where gamete are produced

--> Fallopian tube: This functions to transport the gamete from the site of production in the reproductive system

--> Vagina: connects the internal reproductive fluids to the exterior.

The male reproductive system are also made up of structures that functions together to bring about the fertilization of the female sex cell. Below is the structure matched with the correct function from the question given:

--> Urethra: connects the internal reproductive fluids to the exterior.

--> Sperm:This functions as the sex cell or gamete

--> Testis: The site where gamete are produced

--> Vas deferens: This functions to transport the gamete from the site of production in the reproductive system.

7 0
2 years ago
The _________ includes frozen water in snow, ice, glaciers, icebergs, and frozen ground.
denpristay [2]

Answer:

cryosphere

Explanation:

8 0
3 years ago
What is still lacking in the hypothesis of an asteroid impact as the cause of the end-cretaceous mass extinction?
Doss [256]

A convincing explanation of why some lineages survived while others vanished is still lacking in the hypothesis of an asteroid impact as the cause of the end-cretaceous mass extinction.

<h3>What is an asteroid?</h3>

One of the smaller planets in the inner Solar System is an asteroid. Asteroids are metallic or rocky bodies without an atmosphere, ranging in size from 1-meter pebbles to a dwarf planet with a diameter of over 1000 km.

The majority of the one million or more known asteroids are concentrated in the main asteroid belt, which is 2 to 4 AU from the Sun and between the orbits of Mars and Jupiter. The three categories of asteroids that are typically recognized are C-type, M-type, and S-type.

These were given their names and are frequently associated with, respectively, carbonaceous, metallic, and silicaceous compositions. The largest asteroid, Ceres, has a diameter of over 1,000 km (600 mi), making it a dwarf planet.

To learn more about an asteroid with the help of given link:

brainly.com/question/11996385

#SPJ4

8 0
2 years ago
What element increases after giving blood?
DaniilM [7]
<span>Reticulocytes are immature red blood cells. Red blood cells that haven't fully developed, yet. When our bodies lose a large amount of blood, we rapidly produce reticulocytes, so that our bodies can quickly replenish their red blood supplies. And obviously, when we donate blood, we lose blood.</span>

6 0
3 years ago
Read 2 more answers
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