Which period occurred 360 to 286 million years ago?

1. Cambrian

2. Carboniferous

3. Devonian

4. Silurian

What are stacks of flattened sacs that contain the pigment chlorophyll called?

Explain why some people feel that the development of human cloning is like the development of nuclear weapons.

Describe factors that might constrain the extent of the the realised niche

In glycolysis one molecule of glucose is converted to 2 molecules of

An adequate consumption of fats, especially aa and dha, during the toddler years is especially important for the development of which system?

A colony of termites was exposed to an atmosphere of 100 percent oxygen for three days. the insects were not immediately harmed by the treatment, but the protozoa that lived in the termites' guts were eliminated.

suppose that the amino acids that make up an enzyme's active site are changed. how might this change affect the enzyme?

Which explains how wind causes upwelling in the oceans? A. Wind near the coastline blows cold surface water away from land. Deeper, nutrient-rich, warm water flows upward to replace the surface water. B.

Which organelle breaks down sugar molecules that supply energy to the cell? a. Golgi apparatus b. nucleus c. endoplasmic reticulum d. mitochondrion

A scientist estimated that a mixture would need 5 milliliters of a chemical to balance. The actual amount needed was 7 milliliters. What was the percent error of the scientist's estimation?