Which of the following best describes cell communication processes that are present in bacteria, yeast, and multicellular organisms?
they carry out synaptic signaling, in which neurotransmitters are released and cause a response in nearby target cells.
they have gap junctions that allow molecules to pass through the cell wall without having to cross the cell membrane.
they produce hormones, which travel to neighboring cells and carry out local regulation processes.
they release chemical messengers to communicate with cells they may or may not be in direct contact with.

On a recent expedition to a remote region of northern canada, scientists uncovered skeletal remains from about 100,000 years ago. surprisingly, all the skeletal remains, which included many species from differing biological families and spanned about two thousand years, showed evidence of experiencing temperatures in excess of 1000 degrees fahrenheit (or 538 degrees celsius). which of the following, if true, best explains the apparent paradox between the cold environment and the evidence of the bones experiencing hot temperatures? (a) chemical changes that naturally occur during the process of decay in only one north canadian species produce the same evidence of the species' skeletons being exposed to hot temperatures as the expedition scientists found. (b) a little over 103,000 years ago, a large fire is known to have occurred in northern canada. (c) strong evidence exists that as early as 70,000 years ago, homo sapiens around the world relied heavily on fire to cook animals. (d) in the same expedition and in roughly the same layer of excavation, scientists found rudimentary wood cutting and hunting tools used by early humans.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

The relationship between intron and exon