Which of the following groups of organs provide secretions that nourish and protect sperm cells?

The table represent the thickness top density and bottom density of the different layers of the earth. In most of the layers, the deeper the layer, the thicker and denser the layer becomes.

In fruit flies, the allele for vestigial wings is recessive to the allele for normal wings. In a generation of fruit flies, 18 males and 15 females with vestigial wings are produced, and 43 males and 44 females with normal wings are produced.

Which of the following processes is an example of positive feedback? a. Increase in respiratory rate during exercise b. Shivering when body temperature decreases c. Increase in uterine contractions during childbirth

How do products of photosynthesis reach the other parts of the plant body? Xylem transport Phloem transport Transpiration

All plant and animal groups existing together and the physical factors with which they interact compose a (n)

Aquaculture cannot reduce the number of fish caught in the wild. a. True b. False

Why does the reporter have a tube up his nose? to accurately measure core temperature True or False

Charles Goodyear was a scientist who was looking for ways to keep rubber from melting in the summer heat and becoming brittle in the winter cold. He discovered the solution by accident when someone left a sample of rubber and sulfur on the stove.

Discuss why scientists know so little about Precambrian Earth

If two elements are in the same chemical family then what can be predicted about their Spectra