Which of the following occurrences affects the Earth's water systems?

A.

melting glaciers

B.

extreme drought

C.

increased rainfall

D.

all of these

Four different nucleotides are used as building blocks of DNA. Which of the following can be used to distinguish one nucleotide from another?

When food leaves the stomach it is: A : completely digested B : partly digested C : undigested D : finished with the digestive system

Processes and packages proteins and lipids in the cell

Name the 3 types of RNA and what they do

Describe the location of cervix

Why does the meiosis produce cells with only half the amount of DNA? How does this aid in the formation of a healthy zygote?

Which way does the sun's gravity act on any body in orbit? A. pulls it forward in its orbit B. pulls it backward in its orbit C. pulls it toward the sun

Which two processes result in variations in sexually reproducing species? (1) mutation and genetic recombination (2) mitosis and natural selection (3) extinction and gene replacement (4) selective breeding and cloning

How was the amount of food caught by a heron related to change in biotic and abiotic factors?

Which ecosystem demonstrates the lesser biodiversity? Why?