Answer:
They allow a reduction in chromosomes while preserving most of the cytoplasm for one egg.
Explanation:
In ovary oogenesis occurs for the formation of ovum or egg.
During oogenesis primary oocyte on meiosis - I forms one secondary oocyte and one polar body.
In the next step secondary oocyte on meiosis-II forms one ovum and one polar body.
Polar bodies are small cells which have less cytoplasm.
Polar bodies are meant for preserving cytoplasm to ovum so that ovum is rich in cytoplasm and it has only half of the chromosomes.
Answer:
Its probably option A (I think).
<span>Oxygen-15 is an isotope of oxygen, frequently used in positron emission tomography, or PET imaging. It has 8 protons, 7 neutrons, and 8 electrons. The total atomic mass is 15.0030654 amu.</span>
Oak
Explanation:
Based on the fossil arrangement, we can deduce that the oak was the first to evolve of all the listed fossils.
Fossils are the preserved remains of organisms usually found in rock layers.
To predict the age of fossils, we use one of the principle of relative dating.
The most appropriate one proposed by Williams Smith is the principle of fossil and fauna succession.
It states that "fossils and fauna succeed one another in relative pattern as they evolve".
- The first fossil to evolve will be the oldest one and it will be located at the base of the sequence.
- This is why the choice is oak.
learn more:
fossil dating brainly.com/question/9415077
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<span>There is no primary root. Innumerable thin roots of similar size are present.</span>