*Question*
You are presented with the question "What provides food and shelter to many ocean organisms?" and the following answer choices:  - houses  - umbrellas  - limestone  - ferns  - sharks  - barnacles  - calcite  - sheds  Now knowing that coral reefs provide food and shelter to many ocean organisms and coral reefs are predominantly calcite, choose the best answer.
**Answer**
calcite

*Question*
You are presented with the question "What has a positive impact on a forest animal's survival?" and the following answer choices:  - fire  - horses  - hair  - play  - fur  - warm  - tools  - rest  Now knowing that staying warm has a positive impact on an animal 's survival and animals who live in the forest have very soft, warm fur, choose the best answer.
**Answer**
fur

*Question*
You are presented with the question "What causes nutrients to be available?" and the following answer choices:  - water  - rivers  - saliva  - fats  - Enzymes  - protein  - spring  - Cooking  Now knowing that rain causes erosion and erosion of rock makes nutrients available, choose the best answer.
**Answer**
water

*Question*
You are presented with the question "cells that divide which way may form masses of neoplastic origin?" and the following answer choices:  - non-neoplastic  - controllably  - epidermal  - an organism's body  - seldomly  - epidermis and dermis  - uncontrollably  - Veins and arteries.  Now knowing that cells that divide uncontrollably may form a tumor, or abnormal mass of cells and tumor Tumors are masses of neoplastic origin, choose the best answer.
**Answer**

uncontrollably