Which if the following is a base
a) substance d contains carbon hydrogen oxygen and nitrogen
b) substance b gives off oh- ions that combine with h+ ions when dissolved in water
c) substance c is formed drom the reaction of an acid and base
d) substance a gives off h+ ions that combine with oh- ions when dissolved in water

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Pls need ! in your opinion, what are the limiting factors that might affect the growth or diversity of our ecosystem? respond to this question in claim, evidence, reasoning format. 1. make your claim (i are the limiting factors that might affect the growth or diversity of our 2. follow the claim with 3 pieces of evidence. evidence may be taken from the reading, the videos, previous lessons, or googled answers. site sources, too. 3. use reasoning to explain why you chose your evidence.

The fluid mosaic model of the membrane proposed that membranes