What gives the gem amethyst is purplish color?

a. Quartz

b. Iron

c. Oxygen

d. Titanium

Explain how the circulatory system of cephalopods is different from that of other mollusks

In an experiment involving an enzyme, the pit is raised from 2 to 11. What will be the most likely effect of this increased pH on the reaction?

True or false (if false change the word in parenthesis) : researchers unravel cause and effect in complex natural resources by studying the effects of (two) variables at a time

When Mendel self-pollinated plants from the purple-flowered F1 generation, he saw that one out of every four plants in the F2 had white flowers. What reasoning did Mendel use to explain how the white, hidden trait reappeared?

In a plant cell, how do you distinguish between interphase and telophase?

Why do constellations in the night sky change seasonally? A. Earth rotates around its axis. B. Earth revolves around the sun. C. Earth moves closer to the moon. D. Earth tilts on its axis. 5 / 9 0 of 9 Answered

Which of the following could result from an algal bloom in a river?

A common element among all the river valley civilizations was: irrigation systems that moved water to crops and settlements developed plumbing systems developed written materials the worship of leaders as God's

A person's skin cells and eye cells make different types of proteins to perform their functions. What is the source of the instructions from which all of the proteins are made? (A) Genes (B) Mitochondria (C) Ribosomes (D) Gametes

Small masses of neuron cell bodies located outside the cns are called?