Which of the following eras occurred first?

A. Precambrian

B. Mesozoic

C. Cenozoic

D. Paleozoic

Protist are A. members of the plant kingdom. B. prokaryotes. C. reclassified as scientists learn more about their diversity. D. more like other protists than members of other kingdoms.

The map shows the distribution of three species of organisms observed during a population survey. Identify the pattern of distribution shown by each species clumped uniform random

Groundwater deposits are under threat of depletion and pollution. What are three appropriate solutions for preserving groundwater for the future and protecting it from contamination?

How does pressure exerted in a gas affect it's volume?

Which is most likely to occur if a man's testes are not working properly? Select all that apply. A. Sperm will be formed in a larger than normal quantity B. Fewer sperm cells will be produced C. Less testosterone will be produced

In levels of orginization within an organism what is the order of these words; element, compound, organelle, cell, tissue, organ organ system

Why is fresh water a limited resource? Groundwater is too difficult to access Most water covering Earth is salt water. The supply of water on Earth decreases over time. Too much water is wasted on irrigation

Which sentences describe the differences between photosynthesis and cellular respiration

Compared to most other substances, a great deal of heat is needed to raise the temperature of water by a given amount. This is because water A. is an acid. B. readily forms solutions. C. acts as a buffer. D. has a high specific heat capacity.

Question 1 What is used to classify the layers of the atmosphere? A Differences among temperature altitude, and weather B Differences among altitude, wind speed, and weather C Differences among temperature, air pressure, and density D How far away