Scientists can understand and learn about evolution by studying . however, whole and intact specimens are hard to come by. to study these specimens, scientists use technologies such as
1.a)darwin's voyage b)fossils c)molecular biology
2.a)3-d printers b)theories c)replicas

1. B (Fossils)

2. A (3-D Printers)

Scientists can understand and learn about evolution by studying fossils. However, whole and intact specimens are hard to come by. To study these specimens, scientists use technologies such as 3-D Printers.

Fossils are the preserved evidence or mineralized remains of ancient life (plants and animals). Fossils include shells, imprints burrows, coprolites and organically produced chemicals. Fossils are important records as evidence for evolution because they indicate a progression of evolution. They show that ancient organisms are different from those found today.

3-D printers are technologies that are used to produce three-dimensional solid objects by joining materials together under computer control. To study fossils, scientists use 3-D printers to recreate replicas of fossils.  

1.the evidene of the reaction

2.yes

3.yes

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects