Answer:
The correct answer is option A: "The desert was once a vast ocean".
Explanation:
One of the most prominent fish fossils that were found in the arid deserts of western Egypt belong to the Giant Catfish named <em>Qarmoutus hitanensis</em>, that lived roughly 37 million years ago as it was scientifically determined. The presence of this and other related fossils indicate that the desert was once a vast ocean. Actually, the arid landscape of this zone has been named Wadi Al-Hitan (which means Valley of the Whales) in honor to its past.
B
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Answer:
Cell copies its genetic material during the S-phase of the interphase during cell cycle.
Explanation:
- Cell cycle is broadly divided into two phases ; the interphase and the M-phase.
- M-phase is the dividing phase during which the karyokinesis and cytokinesis takes place.
- Interphase is the phase during which the cell prepares itself for division.
- It is further divided into G1, S and G2 phase.
- During G1 phase the cell prepares for DNA replication and the replication complexes assemble.
- The next phase is S-phase during which the DNA replicates itself and the genetic material in the cell doubles.
- The Next phase is G2 phase during which the DNA is scanned by DNA tepair complexes and errors in the replicated DNA are edited and repaired.
- At the end of G2 phase the cell prepares to enter M-phase.
The correct answer is that they help to retain moisture in terrestrial habitats.
Arthropods exoskeletons and mollusk shells both help to retain moisture in the terrestrial habitats.
Arthropod is an invertebrate animal which have an exoskeleton, paired jointed appendages and segmented body. They are characterized by their jointed limbs which are cuticle and are made of chitin.
They are the most species-rich members of all ecological guilds in most environments.
Molluscs are termed as large phylum which is of invertebrate animals. They are the largest marine phylum and they live in terrestrial habitat and freshwater.