ANSWER ASAP PLZ‼️‼️Humans have hunted elephants into near extinction for the ivory in their large tusks. After less than 200 years, elephants are being born with small tusks or no tusks at all. This gradual change in tusks over time is known as .
a. regeneration
b. evaporation
c. extinction
d. natural selection.

Which statements correspond to cellular respiration? co2 diffuses passively into the cell. co2 diffuses passively out of the cell. co2 must be pumped out of the cell. o2 diffuses passively when produced inside the cell. o2 diffuses passively when converted to co2. o2 is pumped in and forces co2 out.

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain