Tomatoes are growing in an automated hydroponic system. the light, micronutrient concentrations, and aeration have been tested and optimized. there are air and nutrient filtration systems in place to prevent contamination. a technician adds nutrient solution and leaves the system to circulate automatically for the next several months. at first, everything looks great. then, after a couple of months, the tips of the older leaves at the bottom of the plant start to turn yellow-green. growth slows. eventually, the plants die. what do you think is the likely cause of this problem? a. the plants probably died due to calcium deficiency.
b. it was likely a nitrogen shortage because the hydroponics solution is circulating automatically and has not been replenished over the last several months. also, plants need more nitrogen than the other nutrients in the solution. thus, it would be likely that nitrogen would be the first to be depleted.
c. the plants did not get enough sunlight.
d. the plants probably died due to micronutrient deficiency.

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein

They are both used to view parts of the cell

Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.

The answer is a because it say when u add the h+ ions in the periodic table