Seeds sown very deep into the soil fail to germinate.
Seeds sown very deep in the soil fail to germinate because they__________
Seeds sown very deep in the soil fail to germinate because they (a) cannot exert enough force to push the soil upward. (b) do not get enough sunlight. (c) get too much water. (d) do not get enough oxygen.
Seeds are usually sown deep into the soil because: