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padilas [110]
3 years ago
8

Birds and earthworms have _____, containing bits of sand or gravel that mechanically break down food. teeth a tongue a gizzard a

crop
Biology
1 answer:
Len [333]3 years ago
6 0
The correct answer is a Gizzard.

That is because a gizzard contains bits of sand and gravel, while the other mentioned parts of a body do not.
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Considering the drifting of continents, how do you explain the abundance of marsupials and the absence of native placental mamma
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Answer:

this phenomenon is a natural consequence of evolutionary processes and continental drift  

Explanation:

Marsupials are mammals in which newborn offspring are carried in a pouch of the female (mother) body. On the other hand, placentals are mammals that complete embryo development in the mother's body, in the placenta. All the extant marsupials are endemic to Australia and the Americas. It has been shown that marsupials diverged (evolved) in South America, Australia and Antarctica when these landmasses were joined. In Australia, marsupials evolved to fit an ecological niche, which can be attributed to geographic isolation due to continental drift, while placental mammals are relatively recent and more scarce (mainly bats and rodents) within this region.

5 0
3 years ago
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meriva
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Translation is the second part of the central dogma of molecular biology: RNA → Protein. It is the process in which the genetic code in mRNA is read to make a protein. Translation is illustrated in the diagram below. After mRNA leaves the nucleus, it moves to a ribosome, which consists of rRNA and proteins.

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