Did plants first appear in the Ordovician period?

1. What were the biotic and abiotic factors in the ecosystem? 2. List the populations in the ecosystem. Which population was the largest? The smallest? 3. Describe one niche in the ecosystem.

What happens if an atom gains 2 electrons to fill its valence shell A. it becomes more stable and will have 2 + charge B. it becomes more stable and will have a 2 - charge C. it becomes less stable and will have a 2 + charge D.

What are the 3 main mechanisms responsible for genetic variation

7. Which of the following best describes the anthers of a flower? A. Sticky parts of pistils B. Male parts that contain pollen C. Female parts that contain eggs D. Modified leaves below petals 8.

What is the most likely homeostatic reason for developing a fever

Match each term to its scientific definition. 1.) natural world- 2.) theory- 3.) scientific method- A. everything that can be observed or explained scientifically. B. the procedure of scientific inquiry used to investigate natural phenomena. C.

The largest component of air is

Which statement is one of the three parts of a cell theory

Separation of the nail plate from the nail bed in fungal infections is called:

Can somebody describe the fertilization process for plants is