Which statement is true about resource availability and competition in ecosystems? Select one:

Ecosystems have limited resources, and organisms must compete for resources.

The amount of resources available has no effect on the level of competition.

Ecosystems have infinite amounts of resources, and competition is rare.

When the number of resources decreases, competition for those resources also declines.

What is the reason for the “scramble for africa”?

Sandstones that form in aeolian (wind/desert) environments appear very different from other sandstones, such as those formed in a beach/ shoreline environment and in rivers on land. give three identifying properties for each of the three sandstones that would tell a geologist which depositional environment they formed in. consider things such as the relationship between transportation and grain size, shape, roundness, sorting, fossils and composition.

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?