What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
Answer:
the animals die due to the chemicals and stuff in the water
Explanation:
Well, it depends on the purple pea plant. Purple pea plants can have either PP or Pp.
White pea plants always have recessive, so it would have pp only.
So, the expected outcome of the cross would be -
PP x pp or Pp x pp
PP x pp = all the offspring would be purple in colour
or
Pp x pp = half would be purple and the other half would be white
Answer: Ellie is incorrect in thinking TSH is a thyroid hormone. TSH is a pituitary hormone. TSH is the hormone that tells the thyroid to either create more or less of T3 and T4. Ellie’s TSH islow because the hypothalamus is telling the pituitary gland to release lower levels of TSH because the thyroid is pumping out to high of levels of T3 and T4.
Explanation:
<h2>Urea </h2>
Explanation:
Urea is a small nitrogenous compound which is the main end product of protein catabolism in mammals
- Urea is a nitrogen-containing substance normally cleared from the blood by the kidney into the urine
- It is made predominantly in the liver from ammonia and bicarbonate and is one of the main components of urine
- The rate of synthesis varies from 300 to 600 mmol/day depending on the protein intake
- All of this urea eventually finds its way into the urine
- Because urea makes up a large part of the obligatory solute excretion, its osmotic pressure requires significant volumes of water to carry the urea
- Urea passively crosses biological membranes, but its permeability is low because of its low solubility in the lipid bilayer
- Some cells speed up this process through urea transporters, which move urea by facilitated diffusion
- Urea is passively reabsorbed in the proximal tubule, but its route of transport is not clear
- Urea transporters have not yet been identified for the proximal tubule