Crossing over is an event during meiosis that dramatically increases variation in offspring. This cvent occurs between what structures?
a. Chiasma
b. Sister chromatids
c. Nonhomologous chromosomes
d. Nonsister chromatids

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

c. live where it’s cold and icy

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.

ever get the answers? im stuck on this as well