Skeletal support in sponges may be provided by a. spicules of calcium carbonate. c. spongin fibers. b. spicules of silica. d. All of the above

It would be all of above, since they all contained in the skeletal

Maybe haha

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11