Answer:
1/ Climate change
2/ Asteroid impacts
3/ Massive volcanic eruptions
4/ Sun explodes
etc. (all the things above are most likely to happen but alien invasion or things like that is also a theory that you can add depends mostly if you like it or not)
Plants have chlorophyll and chloroform with stacked membranes
At impact, the force due to gravity is =
F
=
m
g
, where we see that a larger force corresponds to a larger mass. To rectify this with your intuition, as in a brick would hurt more if it landed on my head when dropped from a higher distance -- This is true (I don't recommend experiment), but the relevant quantity is
i
m
p
u
l
s
e
, which you can look up, or a more careful analysis of the acceleration of the brick when it lands on something, where we see that at contact, in a very short period of time, the velocity goes from →0
v
→
0
, so the force experienced is:
==∼ΔΔ=−0
F
=
d
p
d
t
=
m
d
v
d
t
∼
m
Δ
v
Δ
t
=
v
−
0
t
ϵ
Where we see that the faster the brick slows down (
t
ϵ
) the larger the force experienced by the brick (and equally and oppositely, your head), which I think is more in the vein of what you are asking.
It is both the nucleus and the chromatin nucleolus. They both contain DNA, which is the genetic information of an organism.
