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4 years ago

What difficulties are encountered in studying living cells of multicellular organisms?

1 answer:

7 0

The difficulties encountered in studying living cells of multicellular organism is that they are difficult to be tackled on as they are compose of cell that is more than one, making it hard for them to be studied and to be identified with different organisms composing multicellular or has more than one cell.

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If scientists believe Earth is actually 4.6 billion years old, why haven't scientists found older

Len [333]

Answer:

So far scientists have not found a way to find the exact age of the Earth directly from Earth rocks because Earth's oldest rocks have been recycled and destroyed by the process of plate tectonics. Ancient rocks exceeding 3.5 billion years in age are found on all of Earth's continents

Explanation:

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3 years ago

Sister chromatids of a pair of homologous chromosomes form tetrads, and crossing-over (exchange of genetic information between r

aleksandr82 [10.1K]

Crossing over (exchange of genetic information between regions of non-sister chromatids in the tetrad) occurs in the prophase I stage of meiosis.

<h3>WHAT IS MEIOSIS?</h3>

Meiosis is the process whereby a single cell produces four daughter cells that are genetically different from one another.

Meiosis is able to ensure genetic diversity in the daughter cells due to a process called Crossing over.

Crossing over is the exchange of genetic material between the non-sister chromatids of homologous chromosomes. It occurs in the prophase I stage of meiosis.

Therefore, crossing over (exchange of genetic information between regions of non-sister chromatids in the tetrad) occurs in the prophase I stage of meiosis.

Learn more about crossing over at: brainly.com/question/394891

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3 years ago

Help ASAP POINTS!

Aleksandr [31]

Answer:

Explanation

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3 years ago

Why was the appearance of blue algae Significant

Soloha48 [4]

Answer: it is capable of fixing the atmospheres nitrogen through the soil

Explanation:

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3 years ago

Denticulate ligaments are thickenings of _________ that extend and fuse with the ______ and inner surface of the _____a.arachnoi

Lemur [1.5K]

Answer:

* ARACHNOID MATER

*DURA MATER

*PIA MATER

Explanation:

denticulate ligaments are bilateral extensions of pia mater that thickening the component of collagen of pia mater.It anchors the spinal cord to the dura mater.They are produced by the pia mater of the spinal cord.They provide stability to the spinal cord within the vertebral canal.

Arachnoid mater helps protect the brain and spinal cord from sudden impact. It is connected to the dura mater at the side that is very close to the central nervous system.

Dura mater refers to the membrane that envelops the arachnoid mater. It surrounds the dural sinuses and also provide supports to it. Dura mater carries blood from the brain toward the heart.

The pia mater is part of pseudolymphatic system and it's referred to as the thin fibrous tissue that allows blood vessels to pass through the brain.

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3 years ago

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