Homologous recombination occurs only between DNA molecules that are identical in nucleotide sequence without any variation.

a. false, because crossing-over does not happen
b. false, because only similar sequence is needed
c. true, for all eukaryotic diploid cells
d. true, but only for cells that have more than 10 chromosomes

b. false, because only similar sequence is needed

Explanation:

In homologous recombination during meiosis,  female and male parent paired chromosomes align so that similar DNA sequences from the paired chromosomes have the opportunity to cross over each other and this is important because it is one of the sources of genetic variation that we see among parent offspring.

Hence, the correct option is b. false, because only similar sequence is needed.

a. possible errors

d. new questions

explanation:

predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.