Which statements describe a host organism? check all that apply.
a host shares nutrients with a parasite.
a host loses nutrients to a parasite.
a host obtains nutrients from a parasite.
ahost is dead when nutrients are taken.
a host is alive when nutrients are taken.

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

Which of the following describes the relationship between elements of an ecosystem

Adepression on the surface of the land caused by the collapse of a cave roof is a blank. a) valley b) sinkhole c) mound