Acactus can either have long needles (l) or short needles (l). a cactus grower crosses two cacti. the cross is shown in the punnet square below.

4 long, zero short

Explanation: the big L is a dominant Gene and the little l is a recessive Gene. The little l always bows down to the big L so if there is a big L present, the big L wins. Since there is a big L in every square, every square would produce a long needle.

The correct answer would be option A. four long needles zero short needles.

Explanation:

The punnet square shows that the parent's genotypes are LL (homozygous dominant) and Ll (heterozygous dominant) which means both parents are long needles as L shows dominance over l that is long needles over short needles.

The punnet square shows that after the cross two offspring's genotypeS is homozygous dominant (LL) while the other two have heterozygous dominant (Ll). So, the phenotype will be four long zero short that is all offspring will have long needles.

Thus, the correct answer is option A.

-hails tea

explanation:

-t poses

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.