Answer:
A.Both store materials needed by the organism
hope it helps..
Answer: Option C.
Population density is the total number of organisms within a fixed area.
Explanation:
Population density is the total number of organisms per unit area. Population density is calculated by dividing the number of organisms by the unit area either in square kilometers, squaremeters, square miles.
Population density =number of organisms ÷ unit of land area.
<span>When there is the presence of gills it will be easy to determine if the animal is aquatic or mollusk.
Aquatic means related to water. While Mollusca is termed as the large phylum of invertebrate animals whose members are called mollusks. Most of the mollusks live in water.
The most numerous mollusks are mantle which is important for cavity and is used for excretion and breathing, the presence of radula and their structure of the nervous system.</span>
No, not every scientific method begin with an observation. on basis of what we want, steps for scientific method changes.
And in scientific method before observation, first we predict (what will happen in the experiment). after prediction we observe. Prediction is known as hypothesis. And observation is what we are viewing.
