List two beneficial interactions.

If + sign is assigned to beneficial interaction '-' sign to determental and "0" sign to neutral interaction, then the population interaction represented by '+''-" refers to

List two general functions of ER.

List two terrestrial adaptations in the reptiles.

List two essential conditions for seed germination.

List two causes of malnutrition.

Bacteria that convert milk into curd play two other beneficial roles. What are they?

List two xerophytic adaptations in the xerophytes.

Why is variation beneficial to the species but not necessarily for the individuals ?