Answer:
The return of blood to the heart is assisted by the action of the skeletal- muscle pump. As muscles move, they squeeze the veins running through them. Veins contain a series of one-way valves, and they are squeezed, blood is pushed through the valves, which then close to prevent backflow.
Answer:
option a
Explanation:
because When hydrogen is used to power a fuel cell, the only byproducts are water and heat—no pollutants or greenhouse gases are produced.
Answer:
Closely related species occupying the same niche.
Explanation:
Competitive exclusion principle states that the two species cannot exist together if they share the same resources. The one species completely exclude the other species from their niche.
Competitive exclusion principle generally occurs between the species that occupy the same niche and are closely related with each other. The competitive exclusion principle first explained between the species <em>P. aurelia </em>and <em>P. caudatum.</em>
Thus, the correct answer is option (B).
Answer:
DNA: 2 strands, Deoxyribose, Nucleus, A pairs with T
RNA: 1 strand, Ribose, Nucleus & Cytoplasm, A pairs with U
Explanation:
The complementary anti-codon will be ATG, iff an mRNA codon reads UAC. ATG or also AUG is defined as the codon for methionine which means the translation initiation codon. The codon AUG, start codon is the first codon messenger of RNA (mRNA) transcript translated by a ribosome.
