D Question 10 0.34 pts How long does a vertebrate species tend to appear in the

Question

D Question 10 0.34 pts How long does a vertebrate species tend to appear in the fossil record? 10 billion years o 1 billion years o 10 years 1 million years 100 million years D Question 11 0.33 pts Why does the discovery of an iridium-rich layer at the end of the an asteroid strike was likely the cause of the Cretaceous extinction? Cretaceous show that Iridium is common in the banded iron formations Iridium Iis very radioactive, with a half-life of 1 day Asteroids are rich in iridium, but the crust of the Earth is not ridium is an organism that forms in impacts Volcanoes spew a lot of iridium when they erupt D | Question 12 0.33 pts Which of the following is evidence that land animals evolved from aquatic organisms? Embryos of land animals develop in a wet environment All of the other answers are correct Fertilization in animals always happens in a wet environment Concentration of salt in seawater is the same as the concentration in blood Proportions of potassium, sodium, and chloride in animal tissues is similer to the in the ocean

Explanation / Answer

Question no. 10:

A vertebrate species generally tend to appear on an average about 100 million years. You will find some vertebrate are as old as 300 million years, some are maybe 20 million years.

Question no. 11:

The discovery of an iridium-rich layer at the end of Cretaceous show that an asteroid strike likely causes the Cretaceous extinction because asteroids are rich in iridium, but the earth crust is not rich in iridium.

Question no. 12:

All the other options are correct. Either it is ratios of elements or if it is the evolutions of the land animal who still does their fertilization in a wet environment all indicate that land animals are evolved from ocean animals.

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