Aphylogenetic tree (select one):

a. shows the similarities between different taxa.
b. is a hypothesis about evolutionary relationships.
c. can illustrate selection pressures that have acted on taxa.
d. shows the number of character changes that have occurred between taxa.
e. must be rooted to properly convey evolutionary relationships.

Option B, is a hypothesis about evolutionary relationships

Explanation:

Phylogenetic trees show the evolutionary relationship between different organism and species. The relationship between species is based upon their physical, biochemical, behavioral and biological traits such as body structure, organ and shape, pattern of feeding, reproduction etc. The tree consists of nest or branches where branching represents deviation of a group of organism from the parent characteristic or trait. Now days, sequences of genes are also used to build phylogenetic trees

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.