The Northern Hemisphere is warmer in spring than in winter, because in spring

A) the days are shorter.

B) it gets more direct sunlight.

C) the Earth is closer to the Sun.

D) it is tilted away from the Sun.

What substance can be seen inside the cell? (It surrounds organelles except for the nucleus of the eukaryotic cell) A. Cytoplasm B. Plasma

Explain why biological macromolecules are important for everyday life

Which cells form the stomata? A. sieve cells B. guard cells C. phloem cells D. mesophyll cells

Materials are transported within a single-celled organism by the

Why are freshwater ecosystems such important resources? Mark all that apply

What type of plate boundary could form a mountain chain of sedimentary rock

What is the citric acid cycle input

Barbara has curly hair. Her genotype for this trait is CC. What do you infer from this? a. The two alleles of the gene are homozygous dominant. b. The two alleles of the gene are homozygous recessive. c.

Anina's normal alveolar ventilation rate (AVR) during mild excerise is 6.0 L/min. She goes snorkeling to a beach, on a warm summer day, water is not too cold. The snorkel volume is 50 ml.

10. What is the difference between a scientific theory and a scientific law?