Which sentence has a shift in verb tense?

the barrier will drop down every time that a train approaches the crossing.

if anyone knows the answer, she does.

as i came in the front door, eddie is going out the back door.

a row of ants had filed up the chair leg and was about to consume our lunch.

pls

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry

The specific heat of ice is 0.5 calories/gram°c. 20 grams of ice will require ll calories to raise the temperature 1°c. 05

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.