Which of the following organisms didn’t survive into the Mesozoic?

What are some of the factors that might explain the global transgression in the Cretaceous?

Banded-iron formations, such as the one in the image below, are composed of thin alternating layers of __________ and __________.

The Cambrian Period is a time in the Earth’s history when

What does the sequence of Pliocene volcanic rocks across the Snake River plain in Idaho suggest about the geology there in the Pliocene? Where is that hot spot today?

While visiting Zion National Park in Utah, you observe sandstones with huge cross-beds many meters thick. What depositional environment do these beds represent?

In the case of lizards with 3 types of male, if a female is in a large harem, which of the three males have the potentiality to make with the female?

How do mice running a maze become better with each generation?

What group of angiosperms has the most species?

Why are ringworm and athlete’s foot hard to treat/cure?