Unit 6.2
What is the main theory scientists use to explain the formation of the moon?
Collision theory.
How many chromosomes do human cells have?
46.
What is a stellar nursery?
It's an area in space where stars are formed.
Chromosomes are made of a chemical substance called...
DNA.
Tectonic plates move due to...
Convection currents in the magma.
The joining of a sperm cell with an egg cell is called
Fertilisation.
What is alignment?
The crystals in the rocks tell the direction of the Earth's magnetic field at the time when the rock became solid. The direction that the crystals are pointing at is called alignment.
The differences between individuals belonging to the same species are called
Variations.
The collection of thousands of fossils that provide us with information about the time before humans were on Earth is called...
Fossil record.
Some individuals have features that make it more likely that they will survive than individuals who do not have these features.
These are called advantageous features, so the individuals are more likely to reproduce and pass on the genes (that produce advantageous features) to their offspring.
Over many generations, the genes that produce these features become more common, and the genes that are not so useful get a bit less common.
Example: Giraffe