<span> There are two main methods of determining the salt content of water: Total Dissolved Salts (or Solids) and Electrical Conductivity. Total Dissolved Salts (TDS) is </span>measured<span> by evaporating a known volume of water to dryness, then weighing the solid residue remaining.</span>
Answer:The Ozone Hole. One billion years ago, early aquatic organisms called blue-green algae began using energy from the Sun to split molecules of H2O and CO2 and recombine them into organic compounds and molecular oxygen (O2). ... As oxygen in the atmosphere increased, CO2 decreased.
Cell membrane .
Photopigments
MItochondria
Nucleus
Contractile vacoule
Answer: A, genes to form different traits.
Explanation: it’s already a question on Brainly.
The term which describes any relationship in which two species live closely together is called SYMBIOSIS.
