The following table shows the currently accepted half-life values for four parent isotopes. Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope?

Rubidium-87
Thorium-232
Uranium-235
Uranium-238

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.

the answer would be b.:

880,000.

hope it ,

bioteacher101

the hardy-weinberg equation is as follows:

where is homozygous dominant, 2pq is heterozygous, and is recessive.

we also know that:

so since we know that homozygous dominant is 0.53, we can solve for p:

so then we can solve for q:

so then we can solve for the heterozygous term:

so now we know that the percentage of the population that should be heterozygous is 39.6%.