Answer:
2.7 billion
Explanation:
This period is referred to as the Great Oxygenation Event. This period saw the evolution of photosynthetic organisms (cyanobacteria) that utilized carbon dioxide (that dominated the atmosphere then) and sunlight to manufacture their energy molecules-glucose. Photosynthesis produces oxygen as a byproduct that is evolved into the atmosphere. As these photosynthetic organisms proliferated on earth, the atmosphere composition changed to become partly dominated by oxygen (which is an oxidaton agent) with less and less carbon dioxide.
Answer:
female gametophytes
Explanation:
The cell called megasporocyte (2n) is usually the mother cell of the megaspores, which are the female spores of spermatophyte plants.
After an meiosis, the megaspore mother cell (2n) will give rise to 4 megaspores (n). Three of these megaspores usually degenerate. The functional megaspore will then develop into the megagametophyte, which will be called the embryonic sac. Initially the megaspore grows and its nucleus divides.
<span>I think the answer would be: instruct the client to bear most of the weight on the unaffected leg and pivot to the chair.
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Hip is a complex and thin bone. Repairing it will be harder than big bones and it will be easier to break again. The client should try to not burden the fractured bone to reduce the risk. At least you need to give the bone time to heal themselves.
<span>The purple loosestrife is an invasive species in the North American ecosystem because they have the ability to colonize that particular ecosystem, disrupting its normal routine or functions. These species may arrive naturally through migration but human activity actually poses the greatest threat in bringing invasive species into different locations, like this example.</span>
Hypocalcemia is the medical condition with<span> low calcium levels in the blood serum.
</span><span>Low calcium levels blood can weaken the bones, create kidney stones, and interfere with the way your heart and brain works.</span>
The effects of Hypocalcemia on the heart are w<span>eak contractions, arrhythmias, and low BP., weak thready pulse.
</span><span>Hypocalcemia causes weak cardiac contractions because it increases the </span>resting membrane potential and the excitability of the cardiac muscle.
