What is the approximate population of humans on Earth now

a. 6 billion

b. 3 billion

c. 1 billion

d. 60 billion

A waste product of respiration in animals that is used by plants to carry out photosynthesis is a. carbon dioxide. c. calcium carbonate. b. carbon monoxide. d. sodium bicarbonate.

What is the plant tissue responsible for limiting water loss A: dermal B:ground C: vascular D:meristem

What does fertilization mean

The key molecule in carbon fixation is RuBP or

Why do mountaineers become breathless as they reach high altitudes

What agents of erosion are assisted by the force of gravity

Which of the following sense organs responds to chemical stimuli? a. eyes c. ears b. taste buds d. pain receptors

What is the interaction between mosquitoes an human beings called?

Which of the following is similar among all living organisms on Earth? cellular function social behavior physical appearance all of these

Lubricants reduce friction by replacing sliding friction with fluid friction, O A. True B. False O