An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains .

Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.

The density of the block of iron is lees than the density of mercury but the density of the block of iron is greater than the density of water