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yaroslaw [1]
3 years ago
14

Phylogenetic trees ________.

Biology
1 answer:
aniked [119]3 years ago
8 0

they are a threatened species

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The order Cetacea includes modern-day whales, dolphins, and porpoises. These marine mammals share common characteristics that ha
allsm [11]

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The correct option is <u><em>A. they evolved from land mammals.</em></u>

Explanation:

The process of evolution explains how closely one organism is to another based on their common ancestors. Scientists believe that those organisms which show many similarities in their structures or functions might have evolved from a common ancestor in the past.

As in the above-mentioned question, scientists have observed that cetaceans lack gills and breath air, this is a property of land mammals. The cetaceans have fin bones which are similar to the limb bones. As limb bones are present in land mammals, hence they cetaceans and land mammals might have common ancestors in the past.

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3 years ago
Which of the following BEST describes the kinetochore? the array of vesicles that will form between two dividingnuclei and give
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a structure composed of several proteins that associate with the centromere region of a chromosome and that can bind to spindle microtubules

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Kinetochores have  vvery important role in the cell division-mitosis.

During the metaphase of mitosis, spindle fibers attach to kinetochores. Some of the microtubules bind to kinetochore (kinetochore microtubules) while other don’t: they connect with the microtubules from the opposite pole, stabilizing the spindle.

During the anaphase, kinetochore microtubules pull chromosomes toward poles, helping the sister chromatids separate from each other.  

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3 years ago
All nonmetals are very reactive.<br> TRUE<br> FALSE
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False, only some . Hope this helps !
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3 years ago
How much bacteria would exist at the end of a 24 hour period if you started at 1 and doubled every 15 minutes
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Now take 2^96 power
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