There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they 14
There are many different species of bird on the Earth today.
Describe how these different species may have evolved from an ancestor such as
Archaeopteryx.

By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. ... This is why scientists cannot be certain about how life began.

for the points

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.