+50 pts how can you tell that algae filaments are composed of several cells rather than just one?

Non-scientific method:

Well, an easy way is observing the filament under a microscope: if it contains one cell it's unicellular and if it contains more than one cell it's multicellular.

Scientific method:

Filamentous algae are, in principle, single-celled. But, sometimes they can form colonies and evolve to be multicellular. But still, if they just form a colony they'll still be unicellular until they start changing.  

Unicellular.

Hope it helped,

BioTeacher101

your a sped   no one cares

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.