History of life

The history of life on Earth traces the processes by which living and (a)   organisms evolved.

When was the Earth formed?

• 4.54 bya

• 1 bya

• 6000 kya

• 6000-10000 kya

Evidence suggests the first (a)   molecules formed on Earth prior to 4.17 Ga.

Select all ancestors common to all the life?

• Last universal common ancestor

• Stromatolites

• First universal common ancestor

• Ediacaran biota

What is a microbial mat?

• layered community of microorganisms

• ecosystem of small plants

• layered community of viruses

• microorganism fossils

• a large rock

Fossils of the algae (a)   have been reported in 1.85 billion-year-old rocks (originally dated to 2.1 Ga but later revised), indicating that eukaryotes with organelles had already evolved.

Identify these fossils?

• Stromatolite

• Ediacaran biota

• Francevillian biota

• Acritarch

• Burgess Shale-type fauna

Which of these is an animal?

• Horodyskia

• Caveasphaera

• Diskagma

• Tawuia

In November 2019, researchers reported the discovery of (a)   , a multicellular organism found in 609-million-year-old rocks, that is not easily defined as an animal or non-animal, which may be related to one of the earliest instances of animal evolution.

Identify this biota?

• Volyn biota

• Huainan biota

• Protosterol biota

• Francevillian biota

• Ediacaran biota