A=P(1/2)^(t/h)
A=final amount
P=initial amount
t=time
h=half life
so
h=1.3 billlion (just write 1.3 and remember to mulipy the end time by 1 billion)
and final amount is 25% of original or 0.25P
0.25P=P(1/2)^(t/1.3)
divide both sides by P
0.25=(1/2)^(t/1.3)
take ln of bot sides
ln(0.25)=ln((1/2)^(t/1.3))
property of logarithms
ln(0.25)=(t/1.3)ln(1/2)
divide both sides by ln(1/2)
(ln(0.25))/(ln(1/2))=t/1.3
times both sides by 1.3
(1.3ln(0.25))/(ln(1/2))=t
remember that this is billion so
(1,300,000,000ln(0.25))/(ln(1/2))=t
2600000000.0001=t
about 2.6 billion years
The answer to the question mentioned above is "Synaptic Cleft".
The region composed of a presynaptic cell, its target cell and the space between them is a Synaptic Cell. This cell exists between the neurons and this is a microscopic gap.
The correct answer is option B, that is, reproducing.
Reproduction refers to the biological procedure by which new organisms, that is, offspring get generate from their parents. Reproduction is a basic requirement of all the forms of life, every single organism prevails due to the outcome of reproduction. There are two modes of reproduction, that is, sexual and asexual.
It is the phenomenon of asexual reproduction, in which a single cell species splits in half and results in the formation of twice as many organisms as before.
Answer: C. Above the kingdom level
Explanation:
Hierarchical classification can be defined as the system of grouping living beings according to the level or orders. Domain secures the highest taxonomic rank in the biological hierarchical classification system. This lies above the Kingdom level. The life forms are classified into three domains, which are Archea, Eukarya and Bacteria.
