<h2>
Answer:</h2>
C. planets revolved around the earth
Explanation:
The other planets besides the sun revolve around the earth says scientists that are in the ISS --International Space Station-- watching it all happen.
This answer was gotten by watching a CNN 10 Teens video.
Answer:
The rock is 3.75 billion years ago.
Explanation:
Given that:
Half life = 1.25 billion years
1 billion years = 10⁹ years
So,
Half life = 1.25 × 10⁹ years

Where, k is rate constant
So,


The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹
Initial amount [A₀] = 80 micrograms
Final amount
= 10 micrograms
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D)
So,





So,
<u>The rock is 3.75 billion years ago.</u>
Well if you want to know how it would be not very effective there you go
Answer:
After Texans had tried to achieve representation in the Mexican legislature, Santa Anna threw out the Mexican democratic constitution and established a dictatorship, which prompted the Texans to revolt.
That's all I have