Answer:
3.9 billion years
Explanation:
The half-life of potassium-40 is the time it takes for half of it to decay.
After one half-life, half of the original amount will remain.
After a second half-life, half of that amount will remain, and so on.
We can construct a table as follows:
We see that the mass will drop to 10 g after three half-lives.
1 half-life = 1.3 billion years
3 half-lives = 3.9 billion years
They are directly related. The more different trees, the more different birds because not all birds like the same trees:
Some like higher trees to build higher nests, others like lower trees, some like the leaves of some trees useful, some live in the trees that give them fruits, other in trees where many insects go, etc.
Hope it helped!
Answer:
eukaryotic cells have a nucleus
Molecule is formed when atoms combine by covalent bonding. The molecule may be polar or non polar.
Answer:
No, you need both mass and volume to determine its desity to see if it can float.
Explanation:
Density is the only thing affecting whether something floats or sinks. If an object has a higher density than the fluid it is in (fluid can mean liquid or gas), it will sink. If it has a lower density, it will float. Density is determined by an object's mass and volume.
