The only option given above that is true for natural selection to occur is option d: 'there must be competition for resources'. Natural selection would also occur under predatory pressure. Natural selection occurs through individuals with advantageous characteristics (phenotypes) surviving and passing on their genes (genotypes) to their offspring.
Long strands of double-helical DNA fit into the nucleus of a single cheek cell, the double helix is packaged and wrapped around proteins, folded back onto itself and coiled into a compact chromosome. 4.
D. Salamander is not a reptile.
It is an amphibian. It looks like a lizard but is not one. It lives on both land and water.
It's Kingdom Animalia; Phylum Chordata; Class Amphibia; Order Urodela with sub-orders Cryptobranchoidea, Salamandroidea, and Sirenoidea
Answer:
D) or A) dont know
Explanation:
Because in 2006 it was no longer considered a planet because it did not meet it did not meet the three criteria the IAU uses to define a full-sized planet.
I hoped this helped you out! in figuring out the answer :)
The correct answer is exotoxins.
<span>Exotoxins are molecules produced by certain species of pathogenic bacteria, usually during their normal growth and metabolism. They are produced inside the cell and released into the environment which is the main difference between those toxins and endotoxins (part of the cell wall in some bacteria). An exotoxin can disrupt the normal cellular metabolism of the host or can even destroy host's cells.</span>
