Which one of these productive methods is the only one available to mosses and ferns

1. Sperms

2. Spores

3. Eggs

4. Seeds

How do you calculate the gradient?

If a rat population that lives in a cold northern tundra climate was moved to the desert, where temperatures are much warmer, and then allowed to evolve for many generations, which of the following hypothetical adaptations would be most likely to

What are the top 10 most abundant elements in the human body?

Fluorine has seven electrons in its outer energy level. According to the octet rule,

What's bigger a lion or a tiger

A sedimentary rock is found to be 300 million years old. Which type of organism is NOT likely to be found in the rock? a) insects b) mammals c) fish d) land plants

James is making models of plant and animal cells using objects supplied by his teacher to represent organelles. For one cell, he will place the objects in a shoebox. First he fills a balloon with water and places it in the shoe box.

What holds DNA and controles cells activities

Usually, a mutation in the promoter region of an operon causes reduced levels of synthesis of the proteins encoded by that operon. Occasionally, a mutation in the promoter region actually causes increased levels of synthesis.

Genes do not exert the only influence on personality. therefore,: