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DerKrebs [107]
3 years ago
7

The Cretaceous-Tertiary extinction, the most famous of the Big Five, has been attributed to what major event(s) that triggered t

he extinction of the dinosaurs? an asteroid hitting the earth massive volcanoes erupting around the world rapid growth of forests on land surfaces falling sea levels increased competition from mammals
Biology
2 answers:
polet [3.4K]3 years ago
5 0

This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.

inna [77]3 years ago
3 0

Answer:

The correct answers are "an asteroid hitting the earth" and "massive volcanoes erupting around the world"

Explanation:

The Cretaceous-Tertiary extinction was an event that take place approximately 66 millions years ago responsible of taking the life of about three-quarters of the plant and animal species on Earth. Two different events are the ones that contributed to this massive extinction: an asteroid hitting the earth and massive volcanoes erupting around the world. The asteroid was 10 to 15 km wide, impacted on Mexico's Yucatan Peninsula, and caused global environmental damage. This damage inlcude triggering the eruption of most active volcanos in the world.

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The cell membrane contains channels and pumps that help move materials from one side to the other. What are these channels and p
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Answer:

The correct answer is ''proteins.''

Explanation:

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When two plants, both tall, were crossed, they produced some offspring that were dwarves. Assuming that the height of the plant
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A chromosome has undergone a translocation that has completely deleted its centromere region, preventing association with spindl
kobusy [5.1K]

Answer:

<h2>The cell will not pass the M checkpoint because its chromosomes will not associate with spindle fibers. or if the cell goes complete division, then the homologous chromosomes will go into either daughter cell.</h2>

Explanation:

 As in the cell cycle, there are various checkpoints, which checks the cell in many steps like G1/S checkpoint, G2, M  etc. They check the integrity of the genome, if there is any defect in the DNA/chromosome, it arrest the cell cycle.

Centromere is the region on the chromosome which binds with spindle fibers and is used in the separation of chromosomes during anaphase of cell cycle. If there is deletion of centromere, then the separation of chrmosome will be affected. Then the homologous chromosome can either go into one of the daughter cell, so one cell will get 2n+1 and other will get 2n-1.

5 0
4 years ago
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