The ______ built mountains in eastern North America that stretched from northern

Question

The ______ built mountains in eastern North America that stretched from northern Canada to the southeastern United States approximately 1.1 billion years ago.

Wopmay orogeny

Grenville orogeny

Taconic orogeny

Keweenawan Supergroup

The general configuration and composition of the ______ and its subsurface counterparts indicate the presence of a failed rift in the eastern United States that was active from 1.2 to 1.0 billion years ago.

Wopmay orogeny

Grenville orogeny

Taconic orogeny

Keweenawan Supergroup

Animal embryos consisting of a few cells approximately 570 million years old point to the existence of _____ and resemble embryos of some living ____.

radially symmetrical animals; worms

bilaterally symmetrical animals; sponges

bilaterally symmetrical animals; arthropods

bilaterally symmetrical animals; echinoids

The oldest eukaryote fossil is ribbonlike algae commonly wound into coils called ______ that are ____.

grypania; 2.1 billion years old

cloudina; 1 billion years old

ediacara; 0.6 billion years old

acritarchs; 2 billion years old

Wopmay orogeny

Grenville orogeny

Taconic orogeny

Keweenawan Supergroup

Explanation / Answer

1.Wopmay orogeny

Explanation - The Wopmay orogen is a Paleoproterozoic orogenicbelt in northern Canada which formed during the collision between the Hottah terrane (north of the Hottah Lake), a continental magmatic arc, and the Archean Slave Craton at about 1.88 Ga.

2) Grenville orogeny.

3. Radially symmetrical animals; worms

Explanation - 570 million years ago- A small group breaks away from the main group of deuterostomes, known as the Ambulacraria. This group eventually becomes the echinoderms (starfish, brittle stars and their relatives) and two worm-like families called the hemichordates and Xenoturbellida.

4.Grypania; 2.1 billion years old

Explanation - Grypania spiralis, 2.1 billion years old. The oldest known fossils on Earth are 3.5 billion year old stromatolites andbacterial body fossils from western Australia and southern Africa. The oldest currently known macroscopic body fossils are Grypania spiralis - distinctive spirally coiled “algae”

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