List, in order, all the parts of the cell involved in getting oxygen into your cells so it can help release energy. (PLEASEE HELLPP) A
Cytoplasm, nucleus, then mitochondria

B.
Cell membrane, cytoplasm, nucleus and then mitochondria

C.
Cell membrane, cytoplasm, and then mitochondria

D.
Cytoplasm, cell membrane, then mitochondria

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.