For a human baby to be born a boy he must receive what?

Explain how the exon/intron structure of genes contributes to the generation of new gene functions during evolution.

Why does water move along its concentration gradients?

What term describes a group of cells that are similar and work together?

The word "atom" comes from a greek word that means a. unmixable. b. uncuttable. c. microscopic.

In the Galapagos islands, marine iguanas swim in salt water and vent excess salt from their nostrils. Iguanas who are more efficient at venting the salt also have more offspring.

Nitrogen is made available in a useful form for animals in the A. fertilizers they absorb. B. plants they eat. C. air they breathe. D. rainwater they drink.

4. One advantage of biodiversity in an ecosystem is ... 1) guarantees that the largest organisms will dominate the area 2) ensures a large amount of identical genetic material 3) develops relationships between organisms that are always positive over

Which part of the brain consists of two hemispheres? what are some of the functions is controls?

Which best describes nitrogen fixiation A. Nitrogen fixiation is the process of creating free nitrogen for plants to absorb. B. Nitrogen fixiation is the breakdown of nitrogen in the soil. C.

How does an animal's behavior Aid survival and reproduction