Which is an example of a competitive relationship?

a. two male bighorn sheep smashing their horns over a mate

b. ticks feeding off the blood of a deer who is then harmed

c. hawaiian bobtail squid glowing because of the bacteria living in its belly

d. cattle egrets feeding off the insects kicked up by the cape buffalo

Which of the following is an abiotic factor in an ecosystem? a. bacteriab. airc. niched. grass(abiotic=non-living) me !

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.